Answer:
d
Explanation:
Charles Darwin proposed that natural selection is the primary mechanism of evolution. The correct option is D.
What is natural selection?Natural selection is the method by which living organism populations adapt and change.
Individuals in a population are innately variable, which means they diverge in the some ways. This variation indicates that some people have traits that are better adapted to their surroundings than others.
Natural selection, Darwin proposed, is a mechanism for evolution in which heritable traits that help support life reproduce and survive are becoming more prevalent in a population over time.
Natural selection occurs when genes that confer a survival or reproductive advantage are handed down and persist in a population, whereas genes that result in lower survival or fewer offspring are becoming less common.
Thus, the correct option is A.
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How can no color change in the broth and a conversion to a yellow color both be considered negative results?
Answer:
Explanation:
A Pure bacterial culture must be grown in sterile tryptophan or peptone broth for 24–48 hours before performing the test. A sterile environment helps to avoid contamination.
When a test is conducted and it shows the presence of a red or red-violet color in the surface alcohol layer it means the result is positive
But when the colour is yellow it indicate negative reaction due to glucose fermentation.
A deviation from two color may also occur when we have an orange color. This colour change is due to the presence of methyl indole
When there is no color change this indicate No decarboxylase which is an enzyme needed for the fermentation reaction.
Color changes are indicator of how successful the reaction was.
What happens to the vegetation around a body that has Just been buried?
Answer:
here's your answer
Explanation:
When buried six feet down, without a coffin, in ordinary soil, an unembalmed adult normally takes eight to twelve years to decompose to a skeleton. However if placed in a coffin the body can take many years longer, depending on type of wood used. For example a solid oak coffin will hughly slow down the process.
pls make it the brainliest
Answer:
The vegatation growth will be suppressed.
Explanation:
This will happen for about a year, then there will be a period of decomposition where the plants grown lush using the body for three years.
I need brainlist for a rank up
Exceeding threshold depolarization at the trigger zone______the likelihood of generation of an action potential.
Answer: Exceeding threshold depolarization at the trigger zone decreases the likelihood of generation of an action potential.
Explanation:
Exceeding threshold depolarization at the trigger zone decreases the likelihood of the generation of an action potential.
What is threshold depolarization?Excessive depolarization at the trigger zone reduces the likelihood of an action potential being generated. The amplitude of the action potential decreases with distance. The number of action potentials increases as the frequency of stimulation to the trigger zone increases.
Because the potassium channels within the cell membrane are delayed, any additional sodium entry activates an increasing number of voltage-gated sodium channels. Depolarization above the threshold causes an increase in Na conductance sufficient for inward sodium movement to instantly swamp outward potassium movement.
Therefore, Excessive depolarization at the trigger zone reduces the likelihood of an action potential being generated.
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What is not a type of mutation?
Deletion
Inversion
Migration
Translocation
Answer: The answer is Migration... Hope this helps... Stay safe and have a great day... :D
Explanation:
If today's first high tide is at 7:00 AM, what time will today's next high tide be?
Answer:
7PM
Explanation:
A new high tide rolls in every 12 hours.
What do we know about the surface of Mercury?
Answer:
It has solid surface that is covered with craters
A fracture in the crust when land moves up, down, or sideways is called a split.
True
False
Answer:
False, the correct answer would be Fault(un-needed but oh well)
Explanation:
Our bodies are made up of the same types of organic compounds as all other living organisms. Complete the following sentences by filling in each blank to indicate the function of each type of molecule in different parts of our body. Our muscles contain lots of protein. This protein enables the muscles to _____________.
Answer:
Contract
Explanation:
The main proteins involved in muscle contraction are called actin and myosin.
What are the two units of measure
Answer:
hope this helped:)
Explanation:
Systems of Measurement: there are two main systems of measurement in the world: the Metric (or decimal) system and the US standard system. In each system, there are different units for measuring things like volume and mass.
There are many different units of measurement that apply to different quantities and variables. However, if we are talking about the most basic units of measurement of the International System of Units (SI), they are:
1. The unit of measurement of length or distance is meter (m). It is often used to measure the size or dimensions of an object.
2. The unit of measurement of mass is the kilogram (kg). It is used to determine how much material is present in an object.
Other derived units of the SI system, such as the second for time, the liter for volume, and the newton for force, are all derived from these two basic units: the meter and the kilogram.
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Which type of radiation on the earths surface by the greenhouse effect?
Answer:
Much of this infrared radiation does not reach space, however, because it is absorbed by greenhouse gases in atmosphere, and is then emitted as infrared radiation back toward the Earth's surface. This process is known as the greenhouse effect. Note(hope this help's)
Explanation:
what is a community?How is it different from a population?
Answer:
community is a rural area where more than two specie's living together
Explanation:
while population is the total number of specie's
from the above answers you can see how community and population are different
What are 3 words for a moving object that always has energy.
Answer:
Moving object always has a kinetic energy
Explanation:
Answer:
Objects that move have kinetic energy.
Sara poured some sand into a pan. How could Sara best demonstrate wind
erosion using this model?
A. Use a spray bottle to moisten the sand with water.
B. Blow into a drinking straw over the sand.
C. Pour a glass of water into the sand.
D. Let a block of ice melt over the sand.
Answer:
b
Explanation:
reason why is because blowing through a straw demonstrates air so when you blow it against sand or dirt it blows pieces of soil or sand away and in different areas.
Blow into a drinking straw over the sand which demonstrate wind erosion using this model. So, the correct option is (B).
What is Wind erosion?Wind erosion is defined as the natural process that moves soil from one place to another by wind energy which can cause significant economic and environmental damage.
It is a major cause of land degradation in arid and semi-arid grasslands, which is one of the processes leading to desertification. Significant wind erosion occurs when strong winds blow on light textured soils that have been heavily grazed during periods of drought.
It can happen anytime and anywhere when the wind blows which can happen in any area where sand or soil is not compacted or is of fine grained nature. Wind erosion not only destroys the land by drying out the soil and depleting the land's nutrients but also results in air pollution.
Thus, blowing into a drinking straw over the sand which demonstrate wind erosion using this model. So, the correct option is (B).
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Which of the following is the primary advantage of sexual reproduction when compared to asexual reproduction?
A There is greater genetic variety in the offspring
B There is a longer development time for the offspring
C There is more food available to the offspring
D There is a greater number of offspring
Explanation:
(1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1÷1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1+1 )
Indicate which of the following observations can be made when observing growth on nutrient agar. Group of answer choices Gram reaction of growth Acid-fast morphology Amount of growth Opacity/clarity of colonies Color of colonies Presence or absence of endospores Shape and /or pattern of growth
Answer:
Amount of growth
Opacity/clarity of colonies
Color of colonies
Shape and /or pattern of growth
Explanation:
An agar plate is a Petri dish containing agar as a solid growth medium supplied with nutrients (i.e., an enriched medium), which enable to culture different microbes ranging from fungi to bacteria. Colony morphology is a widely used approach to describe the unique features of bacteria colonies growing on agar media. These colony features include, among others, shape (round, circular, punctiform, irregular), elevations/depressions (convex, concave, flat), textures (dry, moist, crusty, dull, shiny, mucoid, friable, rough), colors (cream, white, purple, gray, red, green, yellow, blue), etc.
The observation that could be made regarding the growth over nutrient agar would be:
C). Amount of growth
D). Opacity/clarity of colonies
E). Color of colonies
G). Shape and/or pattern of growth.
Observation
The growth of nutrient agar can be observed in above-mentioned ways. The area covered during the growth, the level of clarity amongst them, the color developed by them, and their size and formation as well.This assists in making worthy deductions about them.Thus, options C, D, E, and G are the correct answers.Learn more about "Morphology" here:
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MEIOSIS. Questions
A) Describe what occurs between step 1 and 2.
B) What is the end product of meiosis I?
C) What is the end product of meiosis II?
D)Look at the cells in step 4. Are they all the same?
E) What will the cells in step 4 mature to become?
Answer:
A. DNA replication
B. Two haploid daughter cells
C. Four haploid daughter cells
D. No, they are not the same
E. Gametes
Explanation:
A) Step 1 and Step 2, according to the image attached to this question, depicts the stages of interphase where the REPLICATION of genetic material occurs i.e formation of sister chromatids.
B) Meiosis occurs in two division steps namely meiosis I and meiosis II. Meiosis I, which involves the separation of homologous chromosomes produces TWO haploid daughter cells.
C). However, in meiosis II, sister chromatids separate to produce FOUR haploid daughter cells.
D) The cells in step 4 are not all the same due to a process called CROSSING OVER, which occurs in the Prophase of meiosis I. Crossing over exchanges chromosomal segments between two non-sister chromatids of homologous chromosomes as seen in the color of the images attached.
E) The four daughter cells produced in step 4 will mature into GAMETES, which will be used in sexual reproduction.
Answer:
Answer:
A. DNA replication
B. Two haploid daughter cells
C. Four haploid daughter cells
D. No, they are not the same
E. Gametes
Explanation:
A) Step 1 and Step 2, according to the image attached to this question, depicts the stages of interphase where the REPLICATION of genetic material occurs i.e formation of sister chromatids.
B) Meiosis occurs in two division steps namely meiosis I and meiosis II. Meiosis I, which involves the separation of homologous chromosomes produces TWO haploid daughter cells.
C). However, in meiosis II, sister chromatids separate to produce FOUR haploid daughter cells.
D) The cells in step 4 are not all the same due to a process called CROSSING OVER, which occurs in the Prophase of meiosis I. Crossing over exchanges chromosomal segments between two non-sister chromatids of homologous chromosomes as seen in the color of the images attached.
E) The four daughter cells produced in step 4 will mature into GAMETES, which will be used in sexual reproduction.
Explanation:
.. Studies conducted in England during the Industrial Revolution have shown that children
born to poor families were, on average, shorter than those born to wealthier parents. The
most likely explanation for this difference in height is a difference in
O nutrition.
O family size.
O genetic makeup.
O genetic disorders.
Answer:
genetic make up
Explanation:
this is because the genotype of two parents maybe one was tall the other was for,, environmental factors cannot affect the genotype of an organism,,phenotype can not affect the genotype
Answer:
The answer is 'Genetic Makeup'.
Explanation:
It's pretty simple.
Akira creates a reaction without a catalyst, then repeats the reaction with a catalyst.
Answer:
Akira turns in a written lab report to his science teacher. ... Akira writes in his notes that adding a catalyst sped up the chemical reaction because the catalyst lowered the activation energy needed to start the reaction.
What is transportation in the water cycle
Answer:
Hydrologic Cycle
Explanation:
actually, I'm not sure about this but this one fits the water cycle hehe
Xenotransplantation is using nonhuman animal organs in transplantation. Many people are against this practice. What would be the best argument for why xenotransplantation should be accepted?
A. There are more people on transplantation lists than donor organs so xenotransplantation can save people’s lives
B. People on transplantation lists are not treated equally in that some are moved to the top of the list
C. There are no antigens on the surface of nonhuman animals so there would be no rejection
D. More organs can be extracted from nonhuman to accommodate more recipients
Answer:
A. There are more people on transplantation lists than donor organs so xenotransplantation can save people’s lives
Explanation:
Xenotransplantation, ie using non human animal organs in transplantation, has following most crucial favouring argument
Patients needing transplanted organs are much higher than people willing & able to donate them. So, there is extreme excess demand, needed to be satisfied for saving people's lives.Answer:
The answer is A
Explanation:
The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 70 mV exists across the membrane. The thickness of the membrane is 8 nm. A) If the membrane were empty (filled with air), what would be the magnitude of the electric field inside the membrane? (Assume that this field would be constant in magnitude). B) If the dielectric constant of the membrane is K = 3, what would the field be inside the membrane?3) Cells can carry ions across a membrane against the field ("uphill") using a variety of active transport mechanisms. One mechanism does so by using up some of the cell's stored energy (converting ATP to ADP, for those who remember their biochemistry). How much work does it take to carry one sodium ion (charge = +e) across the membrane against the field?
The inner and outer surfaces of a cell membrane carry a negative and a positive charge, respectively. Because of these charges, a potential difference of about 0.070 V exists across the membrane. The thickness of the cell membrane is 8.0 x 10-9 m.
Which type of energy turns tidal turbines to create electrical energy?
kinetic
potential
solar
thermal
Answer:
A.
Explanation:
Kinetic energy turns tidal turbines to create electrical energy.
What is kinetic energy?Kinetic energy is a type of motion energy, where potential energy can be defined as energy stored to be utilized.
Kinetic energy is very common to be converted into different types of energy to produce electricity.In this case, kinetic energy is first converted to mechanical energy (i.e., by the motion of turbines).In conclusion, kinetic energy turns tidal turbines to create electrical energy.
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Please Help
A neighborhood has experienced a steep increase in the amount of waste generated from individual houses. Which solutions will decrease pollution in the neighborhood?
Encourage people in the neighborhood to use more disposable products.
Burn waste in backyard fire pits.
Have neighbors dump their waste into a nearby river.
Start a recycling program.
Convert waste into reusable products.
There is 2 answers
Answer:
Start a recycling program.
Convert waste into reusable products.
What is the most effective method of first aid when a young child has a fever?
Answer:
Water
Explanation:
Reduce thier temperature, Remove excess clothes and give them fluids such as water or diluted juice.
If a person has type B blood, which statement describes the antibodies present in his or her blood?
a.Only anti-A antibodies are present.
b.Only anti-B antibodies are present.
c.Both anti-A and anti-B antibodies are present.
d.Neither anti-A nor anti-B antibodies are present.
Answer:
a is the right answer.....
Answer:
A only anti-a antibodies are present.
Select all reasons that explain why Mars has more impact craters than earth
I think it's 'earth has more tectonic plates' and 'mars has less volcanic activity'
I'm sorry if it's wrong. I hope this helps! Good luck!
The shape of DNA is described as a double helix. Click all that apply to the description of DNA.
a.DNA is made from a single strand of nitrogenous bases.
b.A double helix resembles a “twisted ladder”
c.The “backbone” of the ladder is made up of alternating sugar and phosphate groups
d.The “rungs” of the ladder are made up of the bases joined by hydrogen bonds
Answer:
B and c
Explanation:
Which bird adaptation is probably less well-developed in flightless birds such as penguins and ostriches?
Answer:
Honeycombed bone structure.
A topographic map would best provide information about which area? state boundaries interstate highways routes of minor roads areas with mountains
Answer:
im pretty sure its c if im wrong then its d
Explanation:
i hope this helps :)
Answer:
D. Areas with mountains :)
The image below shows a river at the bottom of a valley with several rock layers exposed.
The rock layers of this river valley were most likely exposed by which of the following?
A. Volcanic eruption
B. Fossil formation
C. Human impact
D. Erosion and deposition
Answer:
D Erosion and deposition
Explanation:
Brainliest please :)