1500-
NA
4) What directions is Star Creek flowing? How do you know?

Answer:

(a) stabilizing selection

Explanation:

Sickle-cell anaemia is a recessive disorder caused by the presence of two recessive alleles "s", so the genotype is "ss". This disorder is characterized by sickle haemoglobin. In an area with malaria, heterozygous individuals "Ss" (with one dominant allele and one recessive allele) have an advantage. These individuals will have both normal and sickle haemoglobin. But pathogen that causes malaria affects only normal haemoglobin, so heterozygous individuals will have half of the haemoglobin resistant to the pathogen and those individuals are resistant to malaria.

Stabilizing selection favours heterozygotes Ss,  disruptive selection favours dominant (SS) and recessive (ss) homozygotes, while directional selection favours dominant (SS) or recessive (ss) homozygotes. Since in this example, people with genotype Ss (heterozygotes) are at an advantage, then this is an example of stabilizing selection.

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The kind of device in which an alternator can be categorized is a generator of electric energy.

An alternator is a tool/device in a car that converts mechanical energy into electrical energy.

The electrical energy generated by using an alternator is alternate electrical energy.

In conclusion, the kind of device in which an alternator can be categorized is a generator of electric energy.

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Answer: Generator

Explanation:

Answer:

2.all different types of organisms

Answer:

B

Explanation:

Building new incinerators is an action which could help a city reduce landfill waste and is denoted as option B.

This is a method used to treat and involves burning the wastes in special structures referred to as incinerators.

Incineration and recycling are the main methods which help reduce landfill waste.

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The adaptive (specific) defense system:  issues an attack specific to particular foreign substances. hence, option A is correct.

Adaptive immune responses are designed to eliminate invading infections and any harmful chemicals they create. Because these responses are harmful, they must only be elicited in response to molecules that are foreign to the host, not the host's own molecules.

Antibodies and lymphocytes make up the adaptive defense, which is also known as the humoral and cell-mediated responses. The term 'adaptive' alludes to the distinction between self and non-self, as well as the tailoring of a response to a specific foreign invader.

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The cavity which separate or in between the nose and the mouth is the nasal cavity.

The nose and the mouth meet at a junction called the pharnx; option A

The nasal cavity refers to a large, air-filled space above and behind the nose in the middle of the face. It is the cavity which divides the nose and mouth.

However, the nasal septum divides the cavity into two cavities .

So therefore, the cavity which separate or in between the nose and the mouth is the nasal cavity.

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Answer:

An astronaut who weighed 150 pounds on Earth found that his weight on Jupiter was 400 pounds. He captured an alien that weighed 120 pounds on Jupiter. What is the alien's weight on Earth?

Explanation:

a.

45 pounds

c.

500 pounds

b.

30 pounds

d.

320 pounds

Answer:

it will kill paints remove animal homes take more area that was for animals so they will fight over territory even more

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Answer:

Bacteria are economically important as these microorganisms are used by humans for many purposes. The beneficial uses of bacteria include the production of traditional foods such as fudge, yogurt, cheese, and vinegar. Microbes are also important in agriculture for compost and fertilizer production.

Answer:

The human body has 10 microorganisms for every human cell, and these microbes contribute to digestion, produce vitamin K, promote the development of the immune system, and detoxify harmful chemicals. They are also important in agriculture for compost and fertilizer production.

Explanation:

Answer:

cellular respiration

Explanation:

During cellular respiration, glucose and oxygen are changed into energy and carbon dioxide. Therefore, carbon dioxide is released into the atmosphere during the process of cellular respiration.

Answer:

Cell membranes enable organisms to maintain homeostasis by regulating the materials that may enter or leave a cell. Some materials easily cross the cell membrane without the input of energy; other materials require energy input in order to cross through the cell membrane.

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Higher vascular plants contain catalase to metabolize Hydrogen peroxide (H2O2) in mitochondria and chloroplasts.

Catalase is a key enzyme used by organisms to metabolize Hydrogen peroxide (H2O2), which is a reactive substance.

The animal tissues also contain catalase which they use to generate H2O and thus remove toxic H2O2.

In conclusion, higher vascular plants contain catalase to metabolize Hydrogen peroxide (H2O2) in mitochondria and chloroplasts

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Light-dependent reactions are the electron flow along the electron transporter chain. The final products are NADPH and ATP production and Oxygene release.

Light-independent reactions occur in the thylakoyd membrane where pigments are placed. They involve light absorption and the electron flow from water to NADPH.

During light-dependent reactions, oxygen is released, while ATP and NADPH are produced. Both of them are used during light-independent reactions.

Energy is released  as  electrons move through the chain. This energy pumps H+ into the thylakoid compartment, and then they power the formation of ATP as they flow back out.

Steps,

1. Luminous energy is trapped by chlorophyll in Photosystem II.

2. When the pigment molecules absorb light, electrons provided by water molecules get in a higher energy level.

3. The excited electrons go through the electron transport chain from Photosystem II to a less energetic level in photosystem I.

4. When the excited electrons leave photosystem II, they are replaced by new electrons extracted from the water molecules.

5. Luminous energy absorbed move the electrons from the photosystem I to another electron acceptor, from where they get transported again and used to produce NADPH molecules.

6. When electrons leave Photosystem I, they are replaced by new electrons coming from photosystem II.

7. When the water molecule breaks down, hydrogen ions remain in the thylakoid lumen, from where they are pumped to the stroma by the ATP synthase.

8. The released energy is used to produce ATP molecules.

9. Hydrogen ions go back from the stroma to the thylakoid compartment.

a. they convert adp into atp ⇒ true, using energy from H+ pump.

b. they produce oxygen gas ⇒ true, they release oxygen when water molecule breacks

c. they convert oxygen into carbon dioxide ⇒ false, CO₂ is not involved in light-dependent reactions.

d. they convert nadp+ into nadph ⇒ true, they reduce NADP+ into NADPH using H+

e. photosynthesis begins when pigments in photosystem i absorb light ⇒ false, photosynthesis begins when pigments in photosystem II absorb light.

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The five elements of digestion are:-

1. Ingestion:- Taking food into the mouth.

2. Digestion:- Breaking down of food so it can be absorbed into the small intestine.

3. Absorption:- Food passes into blood system from small intestine.

4. Assimilation:- The way in which the body uses food.

Getting rid.

5. Getting rid of undigested and unabsorbed food.

What is digestion?

Digestion is the breakdown of large insoluble food molecules into small water-soluble food molecules so that they can be absorbed into the watery blood plasma.

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c is the right answer

Explanation:

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On leaving the epididymis, the sperm is expelled into the vas deference, thus the correct option is option C.

The sperm are stored in the epididymis. Upon ejaculation, the sperm leaves the epididymis and migrates to the vas deferens.

The vas deferens create a protective fluid that protects the sperm while it's out from the urethra. If sperm does make it into the vagina, there’s a chance that it will fertilize the female egg.

Epididymis is a long tube that functions to transport sperm from the testis to the vas deference. While traveling through the different parts of the epididymis the sperm gets mature and acquires the ability to swim. So epididymis plays an important role in the maturation and transport of sperm.

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Turtles with genes for long necks had a better chance of surviving to reach reproductive age due to ability to reach the food source.

Turtles with genes for long necks had a better chance of surviving to reach reproductive age because the long neck enables the turtles to reach the food source that is present on a certain height. So they are able to survive and complete its life cycle.

So we can conclude that option C is the right answer.

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"The images show two different types of Galapagos tortoises that scientists believe descended from the same species."  the type of turtle found on the islands with high vegetation.  Turtles with genes for long necks had a better chance of surviving to reach reproductive age. Option C. This is further explained below.

Generally, the Galapagos tortoise is simply defined as the Galápagos gigantic tortoise, belongs to the genus Chelonoidis and is the largest species of tortoise.

In conclusion, a turtle species typical to islands with dense flora. Those turtles that had the genes for a longer neck were more likely to live to reproduce.

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Decomposition will occur the fastest in Amazon rainforest.

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Answer:

Columbia Space Shuttle

Cassini

Hubble Telescope

Valentina Tereshkova

John Glen

Yuri Gagarin

Explanation:

Options:

A prostaglandin

B protein hormone

C. peptide hormone

D. steroid hormone

Answer:

Amylin is peptidal harmone. Thus, the correct option is C.

Hormones are the chemical messengers of the body. They make their way through your bloodstream to tissues and organs. They have a long-term effect on a variety of processes, including growth and development.

Amylin is a peptide hormone produced in tandem with insulin by the pancreatic -cell and is hence lacking in diabetics. It works as a satiety agent by inhibiting glucagon secretion and delaying stomach emptying. As a result, amylin replacement could potentially improve glycemic control in some diabetics.

Amylin is a 37-amino-acid peptide hormone released by pancreatic beta-cells in response to a food stimulation together with insulin. It is inadequate in Type 1 diabetes patients and increased in Type 2 diabetes patients in the early stages, a disease marked by hyperinsulinemia.

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Answer/Explanation:

Natural selection is the process in which populations of organisms adapt and change due to their environment. Natural selection can cause a population to go extinct because if the organisms are not suited for their environment, they will eventually die off.

Let's take Charles Darwin's finches on the Galapagos Islands for example. These finches have an incredible diversity in their beak size, shape, etc. This is because the finches need to adapt to their environment in order to survive. During his studies, Darwin noticed a drought was happening on the islands. The finches with the larger-than-average beaks started to die off because the only food available was tiny seeds that only small beaks were able to get. Because of this, the population of the finches changed throughout generations to have smaller beaks, so they wouldn't starve. This is a prime example of natural selection because the finches with the small beaks survived while the finches with the larger beaks did not.

In conclusion, natural selection can help explain how a population becomes extinct because if a population is not suited for their environment they will not survive.

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1. Mountain ranges form along convergent plate boundaries via orogenic processes.

The formation of mountains is caused by tectonic plates. A mountain is formed when two tectonic plates move towards each other and collide, resulting in altitudes that can take years to reach but that eventually create massive mountains through what are known as convergent plate borders.

2. Rift valleys formed through the stretching of divergent plates occurs through a divergent boundary process.

When tectonic plates separate, they can leave low ground areas like the Rift Valley, which are produced by diverging continental plate borders. They can be found on the surface of the Earth or at the bottom of the ocean, and they are formed by the expansion of the seabed.

3. The formation of mountain ranges occurs as a result of orogeny.

This process occurs when one continental plate dips and the other rises, allowing mountain ranges to form. Orogeny is the name given to this process.

4. Scientists observe an extremely long deformation area in a continental plate during an orogenic process..

Scientists use tectonic plate simulations to study this deformation in order to better predict natural disasters such as earthquakes.

5. Epeirogenic process causes vertical plate motion along tectonic plates.

The vertical movement of a continent that generates soft arcs or rises parts uniformly is known as epeirogeny.

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Answer:

its A

Explanation:

Its impossible for a human to have a heart beat of 94 each minute

The statement that represents a wrong concept in his report is as follows:

Thus, the correct option for this question is A.

Heart rate may be defined as a mechanism that significantly involves the number of times the heart beats within a certain time period generally in a minute. In a more simple sense, it may be characterized as the number of contractions of the heart per minute.

According to the context of this question, the normal rate of humans usually ranges from 60 to 100 beats per minute. But being a student of 6th standard, it is too higher because it is ranging from 60 to 80 per minute for that group of children specifically with respect to the capability of their cardiovascular stength.

Therefore, the correct option for this question is A.

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Answer:

The last choice

Explanation:

Hypercalcemia is a condition in which the calcium level in your blood is above normal. Too much calcium in your blood can weaken your bones, create kidney stones, and interfere with how your heart and brain work.

Acid rain is liquid deposition that occurs when sulfuric and nitric acids get dissolved in rainwater and reach the ground affecting the whole ecosystem.

Acid rain refers to the liquid deposition of water drops charged with dissolved pollutive acids, like sulfuric and nitric acids.

Liquid deposition can be caused by rains (acid rain), snow, dew, or fog. During this event pollutive acids are dissolved in atmospheric water drops and are driven to the ground.

Usually, rainwater pH is about 5.6.

However, with high concentrations of acids in the environment, rainwater pH decreases.

When the the rain gets to the ground, they produce a series of chemical changes that alter the natural pH of the soil and water and have a consequent effect on ecosystems.

Day 1

Cup     pH

F           8

E           7

D          6

C          5

B          4

A          3  

Day 2

Cup     pH

D         6

E          7

F          8

C          5

B          4

A          3  

Day 3

Cup     pH

E          7

D         6

F          8

C          5

B          4

A          3  

Day 4

Cup     pH

E          7

D         6

F          8

C          5

B          4

A          3  

According to this data, we can assume that eggs need a neutral to basic pH to hatch. Acid media notoriously affects egg hatching.

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Bones grow from their ends, where the cartilage is located is a true statement.

These are tissues which are soft and non vascular and ensure low friction environment for bones.

Bones grow from their ends, where the cartilage is located at the epiphyseal plate which is a thin plate of hyaline cartilage between the diaphysis and epiphysis.

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Explanation:

Antibiotics cannot kill viruses because bacteria and viruses have different mechanisms and machinery to survive and replicate. The antibiotic has no “target” to attack in a virus. However, antiviral medications and vaccines are specific for viruses.