The initial mass of iodine decay after t days is 6 g
How much of the mass remains after 20 days is 1.053 g
Here's the complete question:
Doctors use radioactive iodine as a tracer in diagnosing certain thyroid gland disorders. This type of iodine decays in such a way that the mass remaining after
m(t) = 6e−0.087t
where m(t) is measured in grams.
a) Find the initial mass (mass at time t = 0).
b) How much of the mass remains after 20 days?
a) Find the initial mass (mass at time t = 0).
m(t) = 6e-0.087t
The unit t is assume to be in days.
m(0) = 6e⁰ g = 6 g
b) How much of the mass remains after 20 days?
Using the equation
m(x) = ne⁻⁰°⁰⁸⁷⁽²⁰⁾
m(20) = 6e⁻⁰°⁰⁸⁷⁽²⁰⁾ g ≅ 1.053 g
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How is water used in determining pH?
PLEASE HELP ASAP
2) The balanced chemical equation. for cellular respiration is:
C6H12O6+602>>>6CO2+H20+heat+ATP
How does this equation represent the law of conservation of matter- that matter. cannot be created or destroyed?
The number of carbon, hydrogen and oxygen are same on the both side of the equation.
Which type of microscopes was developed most recently? (1 point)
O fluorescence microscope
O electron microscope
O scanning tunneling microscope
O light-based microscope
What’s the distinction between Days 1, 2, and 3 and Days 4, 5, and 6? the creation of god
In the account of the six days of creation by God the distinction between Days 1, 2, and 3 and Days 4, 5, and 6 is that God began creation with the non-living things in the environment and ended it with the creation of man in his image.
What are the things created by God during the six days of creation?The Six days of creation by God witnessed several distinct creative activities by God.
God created the universe in six days and on the seventh day, he rested.
The account of the creation by God is as follows:
On the first day, God created Night and Day.On the second day, God created the expanse or the HeavenOn the third day, God created the dry land called Earth as well as the grasses and fruit trees of all kinds. God also created the SeasOn the fourth day, God created the Sun, the moon, and the stars.On the fifth day, God created sea creatures, small and great. God also made the flying creatures of the heavens.On the sixth day, God created the land animals according to their kinds, both domestic and wild animals. Finally, God made man in his own image, male and female, He created them.Learn more about creation by God at: https://brainly.com/question/7095091
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Which graphic organizer best compares the energy inputs and outputs of cellular respiration and photosynthesis?
Answer: B
Explanation:
Photosynthesis takes place in chloroplast uses light from the sun, water, and carbon, from cellular respiration. After photosynthesis, the plant turns that energy into, glucose and releases oxygen with their waste. Then cellular respiration, that takes place in mitochondria, use the glucose and oxygen, and use it and transform it back into water and carbon which will be used back for photosyntheis
bromomethane, ch₃br, is a very useful fumigant against a wide range of agricultural pests, from insects to the verticillium wilt fungus. draw the lewis structure of ch₃br.
We must take into account the number of valence electrons that each atom in this molecule has in order to design the lewiS structure for CH three br.
When we examine our setup. As a result, hydrogen will each have one valence electron while carbon will have four. So, multiplying three by one, bro mean will have seven. We therefore get at 14 when we consider the entire number of electrons accessible. Drawing single bonds to each atom around the core molecule, in this case the carbon, is the first thing we do.
And keep in mind that every bond you draw involves sharing two electrons. I have therefore used up eight of the 14 electrons I had accessible as of the moment I drew this.
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3. Which of the following would best support the theory of evolution?
a. Evidence that shows a change in species over time
b. Evidence that shows how biotic and abiotic factors have changed over time
c. Evidence that shows a decrease in resources but an increase in the number of organisms.
d. Evidence that shows there has been little to no change in a species over time
The theory of evolution will be best supported by the evidence showing a species changes over time. Thus, option A.
Basic evidences for proving the theory of evolution are anatomy, Biological morphology, Fossils and direct observations. There have been various theories for the proof of evolution like structural similarities in an embryo formation pointed towards common ancestors. Theory of Natural selection embarked by Charles Darwin to show genetic variations picked by organisms in whole population.
The most authentic theory over evidence for evolution is Paleontological theory which includes study, observation and acquired prove of fossils of various organisms in the forms of Petrified, mold and cast, trace fossils, compression fossils, impression fossils, etc.
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Be able to explain the carbon cycle – how carbon moves b/w the four spheres – see your mini-cycles.
The carbon cycle cuts across the atmosphere, lithosphere, biosphere and hydrosphere.
What is the carbon cycle?The term carbon cycle has to do with the movement of carbon in the ecosystem. Now we know that the ecosystem is a self sustaining unit of life that is found on earth.
There are four main spheres that make up the universe and these we know them to be;
AtmosphereBiosphereLithosphereHydrosphereWe know that carbon moves across all of these spheres and I would show you how. Respiration and photosynthesis are the key ways that carbon enters the atmosphere. Carbon enters the hydrosphere by means of the dissolution of carbon dioxide in water.
In the lithosphere, carbon is introduced by the process of decomposition that return carbon back to the soil. We know that carbon is contained in all the living things thus carbon is found in the whole biosphere.
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A day in the life of a bird short essay
1. Why are the plates moving and how do they move relative to each other?
2. In what way does the motion of the plates explain the different ages of Earth’s crust?
3. How does the motion of the plates create different surface features? Give at least 3 examples.
1. The heat from radioactive action within the interior of the planet causes the plates to move, sometimes toward and sometimes away from each other.
2. Earth's surface activates with respect to tectonic theory, moving as much as 1-2 inches a year. The many tectonic plates shift and interact with each other. This motion transform the Earth's outer layer. Hence the movement may causes Earthquakes, volcanoes and mountains .
3.Plate motions cause mountains to rise where plates are push together, or converge, and continents to fracture and oceans to form where plates pull apart, or diverge. Hence it results in formation of mountain, ocean and continents .
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Identify one condition, other than identical young plants, that should be held constant during the experiment
Micropropagation (Tissue Culture) is one condition, other than identical young plants, that should be held constant during the experiment.
Micropropagation- Micropropagation is a technique for generating new plants by growing very small fragments of plant tissue from a mother plant that has been carefully selected and prepared in a lab. It is extensively utilized in industrial horticulture. A technique called micropropagation uses tissue culture methods to create plantlets that are genetically identical.
Tissue- A collection of cells with similar structures and functions is referred to as a tissue. The intercellular matrix, a nonliving substance, fills the void between the cells. There might be a lot of this in certain tissues and not much in others.
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Place the steps of the respiration process in the correct order.
During respiration, 3) Air enters the nostrils. 1) Air passes from the trachea to the bronchi. 4) Air diffuses from the alveoli to the blood cells. 2) Oxygen enters the blood cells. 5) Blood transports oxygen to other cells.
What is respiration?During respiration process occurs gas interchange between the body and the environment.
There are two types of respiration,
1) External respiration involves two different stages, inspiration - inhalation- and expiration -exhalation-.
• During inspiration, the diaphragm and intercostal muscles contractions enhance the size of the thoracic box and reduce internal pressure. As a result, air flows in and fills the lungs.
• During expiration, the diaphragm relaxes, and the volume of the thoracic box diminishes, increasing the internal pressure and making the lungs contract, which results in air expulsion.
2) Internal respiration, during which blood and cells interchange oxygen and carbon dioxide.
Steps:
1) External respiration - Inhalation
Air passes from the environment to the lungs through the nose or mouth.
Oxygenated air moves
• From the nose or mouth to the pharynx.
• From the pharynx to the larynx.
• From the larynx to the trachea.
• From the trachea to the bronchia.
• From bronchia to bronchiole.
• Finally, from the bronchiole to alveoli.
Gas interchange with blood occurs in alveoli.
2) Internal respiration - Systemic circulation
The oxygenated blood moves from the lungs to the heart and the rest of the body.
Gases interchange occurs during this step. Cells take oxygen and release carbon dioxide.
Deoxygenated blood moves from tissues to the heart and from the heart to the lungs, releasing carbon dioxide there.
3) External respiration - Exhalation
Carbon dioxide is released by expiration.
Correct order of steps
3) Air enters the nostrils.
1) Air passes from the trachea to the bronchi.
4) Air diffuses from the alveoli to the blood cells.
2) Oxygen enters the blood cells.
5) Blood transports oxygen to other cells.
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Complete question
Place the steps of the respiration process in the correct order.
1) Air passes from the trachea to the bronchi.
2)Oxygen enters the blood cells.
3)Air enters the nostrils.
4)Air diffuses from the alveoli to the blood cells.
5)Blood transports oxygen to other cells.
What areas of the brain are responsible for creativity in the brain.
Answer:
Frontal cortex Is we’re you get ur great creativity at
Explanation:
During __________, frequently used synaptic connections in the brain strengthen while rarely used connections tend to thin. a. assimilation b. accommodation c. scaffolding d. synaptogenesis please select the best answer from the choices provided a b c d
During synaptogenesis, frequently used synaptic connections in the brain strengthen while rarely used connections tend to thin. The correct answer is option(d).
Synapses, the points of contact where information is passed between neurons, are formed during a process known as synaptogenesis. This is necessary for the development of brain networks as well as for the overall design of brain connectivity. Synapses may have an electrochemical makeup. The brain expands significantly while a child is a baby. Synapse creation between neurons explodes in the early stages of brain development
The creation of synapses is a crucial step in brain development. It takes place after the birth, migration, and initial differentiation of neurons, and it is crucial for the development of neural networks. In the adult brain, synaptogenesis is still crucial for the activity-dependent restructuring of neural networks.
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.
Where do cows being treated with antibiotics live?
Study the Punnett square to help you to choose the words to finish the sentences
The complete sentence is: In a dihybrid cross of homogygous pea plants with round (R) yellow (Y) seeds, there will be a 9:3:3:1 ratio of 9 round yellow, 3 wrinkled yellow, 3 round green, and 1 wrinkled green plant.
One homozygous yellow round seed (YYRR) is crossed with another homozygous green wrinkled seed (yyrr). All plants in the F1 generation are heterozygous yellow round (YyRr). When this plant is self-pollinated, nine yellow round plants, three yellow wrinkled plants, three green round plants, and one green wrinkled plant are produced in the F2 generation.
The Punnett square is a table that lists every conceivable result of a genetic cross between two people of known genotype. The Punnett square is a square that has been partitioned into four quadrants in its most basic form.
The ratio of the dihybrid phenotypes is 9:3:3:1.
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When a molecule of oxygen moves from outside of a eukaryotic cell to eventually be reduced by complex iv of the electron transport chain, how many phospholipid bilayers does it need to cross?.
Complex 4 called cytochrome a₃ is responsible for the conversion of O₂ to H₂0 by crossing 4 phospholipid bilayers.
What is a phospholipid bilayer and how cytochrome reduces Oxygen?The ETS called an electron transport system is embedded in the inner membrane of the eukaryotic cell for the process to be carried out.The NADH+H is reduced to NAD through complex 1 (FeS) then succinate is converted to fumarate through complex 2 FAD and FeS.The complex called cytochrome b, FeS, and cytochrome c₁ has a rollover from complex 2 and the 1/2 O₂ reduced to H₂O is this step by cytochrome that is reduced.And finally, the ATP synthase that is ADP+ Pi to ATP.To know more about the Electron transport chain visit:
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Explain how the above jars contain mini biospheres. The jars stones, seaweed, (which can live underwater), shrimp, and water sealed with a clear glass jar. They are on a still and exposed to sunlight ? Do they contain these necessities for life ? What are these necessities ? Explain how the jars contain these necessities or not . Is this a closed system. ? Explain all of your answers.
The jars contain mini biospheres that have all the required elements for their survival. They are exposed to sunlight and contain all the necessities. It is a closed system.
What is a mini biosphere?
Mini biospheres are tiny ecological environments that surround and support life by absorbing natural resources like heat and light. A jar biospheres' fundamental tenet is that its ecosystem can survive without your assistance.
A self-sustaining terrarium is a carefully balanced plant ecosystem inside a closed container under exposed sunlight. So that they can coexist harmoniously, plants, environmental factors, microfauna residents, and even the container itself must all be properly taken into account. The necessities are the ecological processes in the jar that contain mini biospheres, such as the decomposition of organic materials. If they work properly, they supply nutrients for bacteria, algae, and other organisms to develop and reproduce.
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Which statement best describes the relationship between a hypothesis and a
scientific theory?
A. A scientific theory is used to test a hypothesis.
B. A scientific theory can be proven or disproven by a hypothesis.
C. Multiple supported hypotheses are used to form a scientific
theory.
D. Scientific theories are based on facts, while hypotheses are based
on predictions.
A scientific theory is used to test a hypothesis. The correct option is A.
What is a scientific theory?A scientific theory is an explanation of an aspect of the natural world and universe that has been repeatedly tested and corroborated using accepted protocols of observation, measurement, and result evaluation.
A scientific theory differs in that it is a broad general explanation that usually includes multiple hypotheses or observations.
A scientific model is used to test a scientific hypothesis or to represent a scientific theory.
Thus, it can be concluded that a hypothesis can be tested by scientific theory, means the correct option is A.
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Answer:
Its c, Multiple supported hypotheses are used to form a scientific
theory.
Explanation:
I got it right
Using the characteristics of life, explain why your lab stool is not alive.
Some of the important characteristics of life are:-
Metabolism: It is a major characteristic of life without exception. All living organisms are made of chemicals. These chemicals, small or big, belonging to various classes, sizes, functions, etc., are constantly being made and changed into other biomolecules. These conversions are chemical reactions or metabolic reactions.
The sum total of all the chemical reactions occurring in our body is metabolism.
No non-living object exhibits metabolism here for eg. a lab stool that does not exhibit metabolism and hence is not alive.
Reproduction, is also a characteristic of living organisms but with a few exceptions. No non-living object is capable of reproducing or replicating by itself. Hence again it shows why a lab stool is not alive as it cannot reproduce as a living organism can.
The most complicated feature of all living organisms is the ability to sense their environment and respond to these environmental stimuli which could be physical, chemical, or biological. No nonliving object possesses such qualities.
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A stool is non-living as it does not possess any of the characteristics of a living organism.
Characteristics of life are
1.Sensitivity or Response to Stimuli- Living organisms shows response to diverse stimuli like plants shows sensitivity to light, they bend towards the source of light. A stool does not show any kind of response to different stimuli.
2.Reproduction- All the living organisms are capable of reproduction whether sexually or asexually but a stool having no living cells is not capable of reproduction.
3.Growth and Development- Organisms do show growth in their body and their structure but a stool is similar all the time it cannot grow on its own, it can only be modified with human efforts.
4.Energy Processing- All organisms use a source of energy for their metabolic activities. Some use energy from sun like plants and some use chemical energy from different substances to carry out metabolic activities. A Stool cannot perform metabolic activities in it as it has no living cells.
5.Regulatory mechanism- Even the smallest organisms are having complex structures and require multiple regulatory mechanisms to perform functions, respond to stimuli, and do other many things.
Hernce from the above points we can conclude that a stool is nonliving object as it does not show any response to stimuli, has no growth and development, is incapable of reproduction, also need no energy.
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Homeostasis is the process of maintaining a cell's environment. this includes the regulation of calcium ion (ca+) concentration within the cytoplasm. if too much ca+ is inside a cell, how can the concentration be changed?
Homeostasis is the process of maintaining a cell's environment. this includes the regulation of calcium ion (ca+) concentration within the cytoplasm. If too much ca+ is inside a cell Excess Na+ ions will be transported out through membrane protein channels.
The constant internal, external, and chemical conditions that biological systems maintain are known as homeostasis. The organism must keep a number of variables, including body temperature and fluid balance, within prescribed ranges in order to function at its best.
The homeostasis of the organism maintains optimal levels of enzyme and cell activity. It is the preservation of a constant internal environment despite changes in internal and external environments. One of these is controlling the body's blood glucose levels. A protein channel, which acts as a pore in the membrane to let water molecules or small ions pass through quickly, is an example of a transport protein.
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Camels produces very little sweat and small amount of concentrated urine. This is a type of adaption called
Camels produce very little sweat and a small amount of concentrated urine due to their adaptation trait developed with respect to desert conditions.
This is a type of Physiological adaptation.
Camels are also known as the "ship of the desert" because their structure, behaviour, whole body shapes, and habits are well adapted to the desert.
Camels drink a lot of water whenever they get it and then stores them in their body for further survival in the desert.They excrete less concentrated urine and their dung is usually dry as that's how their digestive system has adapted to the desert.They produce less sweat as sweating more will lead to dehydration for them and requires them to drink again and again. Similarly, they have padded feet for easy walking on the sand, long eyelashes and hairs for dust protection, and hump for the storage of fats, etc.To learn more about adaptation, refer to the below link:
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Camels mainly produce very little sweat and the small amount of the concentrated urine due to their adaptation trait of the developed with the respect to desert conditions. This is a type of the Physiological adaptation.
As per its name, the physiological adaptation refers to the internal organs, tissues and the cells. In this type of the adaptation, the cellular features, of the internal organs, changes in the hormonal level, and the mood swings and the other features that help an organism to survive, the adapt and the respond to the changes in its environment. the Snakes and the spiders that produce venom to paralyze to their prey and make them easier to digest. and also Many fish and and some reptiles are the cold-blooded to cope with the living in a cold-water environment.
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Help me identify the three uses of figurative language in the poem
URGENT PLEASE HELP WILL MARK BRAINLIEST
1.) what would be the same category as "kinds" in the Taxonomic classification system?
2.) Why do we have species now that cant produce fertile offspring?
I only know no 2
According to the biological species concept, organisms belong to the same species if they can interbreed to produce viable, fertile offspring. Species are separated from one another by prezygotic and postzygotic barriers, which prevent mating or the production of viable, fertile offspring.
Which of these choices is a benefit of replacing a coal-burning power plant with a nuclear power plant?A.Increased cancer rates among local residentsB.Improper storage of radioactive wasteC.Groundwater contamination from radioactive wasteD.Improved respiratory health of local residents
Improved respiratory health of local residents is a benefit of replacing a coal-burning power plant with a nuclear power plant (Option D).
What is a nuclear power plant?A nuclear power plant is a plant that generates energy by nuclear fission, which is a process where an atom splits into two minor particles, thereby relating energy. This energy is used to heat water and then the vapor is used to move turbines that generate electricity.
In a nuclear power plant, the overall process does not produce greenhouse gases (such as for example carbon dioxide) alike coal based plants and therefore it maintains the quality of the air and atmosphere
Therefore, we can conclude that nuclear power plants do not generate contaminant greenhouse gases and therefore they are able to maintain the quality of the air in normal conditions that are suitable for respiration.
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What system is most responsible for sensing that there are low water levels in the body and letting you know that you need to drink water to maintain your homeostasis?.
Coast Redwoods have been known to reach this size and age:
A. 50 feet tall; 10 feet diameter at breast height (DBH), and 200 years old
B. 380 feet tall; 30 feet diameter at breast height (DBH), and over 2,500 years old
C. 10 feet tall; 40 feet DBH, and 300 years old
Coast Redwoods have been known to reach 380 feet tall; 30 feet diameter at breast height (DBH), and over 2,500 years old.
So. option B is correct.
What are Coast Redwoods?
Coast Redwoods can be referred to as the sole living species of the genus Sequoia in the cypress family Cupressaceae.
The Coast Redwood is an evergreen, long-lived, monoecious tree living 1,200–2,200 years or more.
This species includes the tallest living trees on Earth, reaching up to 115.9 m (380.1 ft) in height (without the roots) and up to 8.9 m (29 ft) in diameter at breast height.
The leaves of the red coast Redwoods vary from being 15–25 mm (5⁄8–1 in) long and flat on young trees and shaded lower branches in older trees. The leaves has a structure of being scale like, 5–10 mm (1⁄4–3⁄8 in) long on shoots in full sun in the upper crown of older trees, with a full range of transition between the two extremes.
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Which is an example of symbiosis? Which is an example of predator-prey?
explain how wastage of food contributes to loss oif energy and global warming
The wastage of food contributes to loss of energy and global warming because We waste not only the food itself, but also the water and energy needed to grow, harvest, transport, and package it.
How food waste contributes to global warming?The climate change dilemma is made worse by food loss and waste because of the large greenhouse gas (GHG) emissions it produces.
Food waste is environmentally hazardous even without incineration. Methane, a greenhouse gas that is 28 to about 34 times more potent than carbon dioxide and one of the main causes of climate change, is released when it rots away in a landfill.
Additionally, rotting food in landfills releases methane, an even more potent greenhouse gas than carbon dioxide.
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suppose that there were two natural isotopes of copper. 80% of the atoms had a mass of 63, and 20% of the atoms had a mass of 65. what would that average atomic weight of copper be?(round your asnwer to 3 sit figs and do not include units)
According to the given statement that average atomic weight of copper be 63.4u.
What is an element's atomic weight?The use such of an element's atoms expressed in atomic mass units is known as its atomic weight (amu, also known as daltons, D). The mass of each isotope is divided by its abundance to produce the atomic mass, which is a weighted sum of all the isotopes of that element.
Briefing:The mass percentage of the isotope with atomic number 63u is 80%.
The mass percentage of the isotope 65u has a value of 20%.
average atomic mass = 63 x 80/100 + 65 x 20/100
= 50.4 + 13
= 63.4u
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