The process of natural selection is based on the assumption that: (1) environmental changes will cause changes in body structure in individuals (2) most changes from generation to generation are the result of mutations (3) part of the population of organisms always remains stable (4) different traits inherited by offspring have different survival value

QUESTION POSTED AT 18/01/2020 - 06:22 AM

Answered by admin AT 18/01/2020 - 06:22 AM

Answer:

Option B, most changes from generation to generation are the result of mutations

Explanation:

Through the process of evolution, an individual changes from one generation to other generation. These variations are caused by genetic changes.

Genetic variations are caused by -

a) Genetic mutation

b) genetic recombination

Genetic variation leads to alteration of gene or protein function due to which differences traits arises in an organisms. Thus , it can be said that genetic mutation brings variation in structure and thus leads to evolution of any species.

As long as  generations of individuals with the newly developed trait continues to mate and reproduce, new trait becomes  common in a population.

Hence, option B is correct

Post your answer

Related questions

Amylase becomes denatured at a temperature of 80°C. During an experiment to study the effect of varying temperature on enzyme activity, amylase's reactivity with starch was measured at body temperature (37°C), and then again at an increased temperature of 42°C. How would this increase in temperature affect the experiment? A) The reaction will stop. B) The enzyme would become inactive. C) The rate of reaction will increase. D) The rate of reaction will decrease.

C, When you want to dissolve salt or sugar into water, it dissolves easier and faster in hot water than cold water. he increase in temperature affects the experiment in such a way that amylase does not efficiently break down starch than it was in normal body temperature (37°C). This is because the structure of amylase will change, thus it cannot interact well with starch than its original structure at  37°C.

ANSWERED AT 16/02/2020 - 07:06 PM


QUESTION POSTED AT 16/02/2020 - 07:06 PM

I need help with five multiple choice marine science questions. 1)When severe weather damages the plant life in an ecosystem, what effects might this have on other organisms in the same ecosystem? a)- Other organisms could starve or have to leave the area if they depend on the plants as food. b) -Other organisms could change their behavior to take the place of the plants in the ecosystem. c )-Other organisms would not be affected. d )-Other organisms could replace the plant energy with radiant energy from the sun. 2)As the climate changes, the average ocean temperature is rising. Using this information, predict what will most likely happen to El Niño events in the future. a)-El Niño events will intensify because they rely on warmer water sinking to the seafloor. b)-El Niño events will intensify because they will build on the already warm waters at the equator. c)-Some El Niño events will be stronger, but most will be weaker because the ocean currents are unpredictable. d)-El Niño events will become more similar to La Niña events and establish a new weather pattern. 3)Which of the following examples is the most likely way severe weather can negatively affect the biodiversity of a marine ecosystem? a)-A severe thunderstorm brings rain and wind to an intertidal zone. b)-A storm surge from a hurricane floods a coastal area. c)-A tornado causes a waterspout. d)-A blizzard adds snow and ice to an arctic glacier. 4)El Niño events are characterized by warmer than normal ocean temperatures near the equator in the Pacific Ocean. Which weather events are most likely to occur as a result? a)- Increased rainfall across the eastern Pacific Ocean b)-Decreased flooding across the eastern Pacific Ocean c)-Drought along the South American Pacific coastline d)-Colder winter along the South American Pacific coastline 5)According to the Severe Weather Activity worksheet, El Niño events most likely occurred during which of the following years? a)-2006 and 2015 b)-1997, 2006, and 2015 c)-1997 and 2015 d)-1997 and 2006

1. The answer is A. The eradication of plants in an ecosystem would devastate the food web in the habitat. This is because plants are primary producers and significant as conduits of energy into a food web. Plants convert radiant energy from the sun to biomass through photosynthesis. This energy then transferred up the food chain through various form of interaction such as predation.

2. The answer is B. Global warming causes water at the equator to be even warmer above normal temperatures. This fans the upwelling of cold water from below the ocean floor and causes an even greater disparity of temperatures across the Pacific ocean. This subsequently fans the trade winds hence warming the air even more and causing severe storms.

3. The answer is B. The flooding of the coastal area due to hurricanes destroys the biodiversity of the ecosystem by physically destroying the habitat and by drowning organisms such as affecting a whole species population. This upsets the balance of the ecosystem and makes it prone to even further deterioration.

4. The answer is A. When the surface ocean waters at the Pacific ocean warm at the equator, there is an upwelling of cooler ocean waters from the bottom of the ocean., The warm currents along with trade move towards the east and met the South American coastline where they bring in heavy rainfall. Conversely, the northwestern region of the Pacific experiences drought.

5. The answer is C. Elnino and La Nina occurs at a frequency of approximately two(2) to seven (7) years. The phenomenon usually lasts nine (9) to twelve (12) months. El Ninos are more frequent than La Ninas. Their peak effect is usually felt around December and January. The strongest El Nino was the one that occurred in 1997.

ANSWERED AT 16/02/2020 - 07:04 PM


QUESTION POSTED AT 16/02/2020 - 07:04 PM

What forms whenever a large body of air over land or water does not move for a long period of time?

The answer for this one is Air Mass.

ANSWERED AT 16/02/2020 - 06:58 PM


QUESTION POSTED AT 16/02/2020 - 06:58 PM

1. Restriction enzymes are naturally occurring proteins genetically engineered proteins enzymes that cut proteins B then C A then C 2. Plasmids can be used to cut DNA can be used to insert DNA into bacteria can be used to digest proteins A and C All of the above 3. Name the technique used to increase a quantity of DNA. plastid technology genetic engineering PCR RNA Recombinant DNA technology 4. What tool does one use to separate DNA fragments? an electron microscope a cyclotron a mass spectrograph a Polyacrylamide gel a centrifuge (high speed) 5. DNA fragments hav 1. Restriction enzymes are naturally occurring proteins genetically engineered proteins enzymes that cut proteins B then C A then C 2. Plasmids can be used to cut DNA can be used to insert DNA into bacteria can be used to digest proteins A and C All of the above 3. Name the technique used to increase a quantity of DNA. plastid technology genetic engineering PCR RNA Recombinant DNA technology 4. What tool does one use to separate DNA fragments? an electron microscope a cyclotron a mass spectrograph a Polyacrylamide gel a centrifuge (high speed) 5. DNA fragments hav ...?

1. Restriction enzymes are

A then C

2. Plasmids

can be used to insert DNA into bacteria


3. Name the technique used to increase a quantity of DNA.

PCR


4. What tool does one use to separate DNA fragments?

a Polyacrylamide gel

Hope this answers the question. Have a nice day.

ANSWERED AT 16/02/2020 - 06:46 PM


QUESTION POSTED AT 16/02/2020 - 06:46 PM

Use the Law of Syllogism to draw a conclusion from the two given statements. If you exercise regularly, then you have a healthy body. If you have a healthy body, then you have more energy. You have more energy. If you do not have more energy, then you do not exercise regularly. If you exercise regularly, then you have more energy. You have a healthy body. ...?

The correct answer for this question would be the third option. Using the Law of Syllogism, the conclusion that can be drawn from the two given statements is that, if you exercise regularly, then you have more energy. The use of syllogism is the kind of reasoning wherein a conclusion is being drawn from two given propositions. Hope this answer helps.

ANSWERED AT 16/02/2020 - 06:42 PM


QUESTION POSTED AT 16/02/2020 - 06:42 PM

Suppose that a when a cell phone store charges 16$ for a car charger, it sells 92 units. When it drops the price to 15$ it sells 96 units. Assume that demand is a linear function of price. If each phone charger costs 1$ to make, what price should the store charge to maximize its profit? If x is the number of times the price is reduced by one dollar. Find a function for total profit with respect to x. A negative value for x will mean the price is increased. ...?

If you put the dollar decrease as x, you sell charge
16−x

dollars and sell
92+4x

units for a profit of
(16−x)(92+4x)−(2+4x)

dollars. the last subtraction because your cost is $1 per unit multiply out and
get
P=−4x2−32x+1470

which will have a maximum at the vertex
x=−b/2a

32/(2(−4)) 

= −4

I hope the answer has come to your help. Thank you for posting your questions here in Brainly!


ANSWERED AT 16/02/2020 - 06:39 PM


QUESTION POSTED AT 16/02/2020 - 06:39 PM

Some biology students wanted to determine whether a pair of brown mice purchased at a pet store was homozygous dominant or heterozygous for fur color. They let the mice mate and examined the offspring. Six mice were born. All six had brown fur. Some of the students felt that this was enough evidence to prove that the mice were homozygous for brown fur color. Other students did not, so another experiment was planned. Describe the next experiment the students could conduct to determine whether the parent mice are homozygous brown or heterozygous. Explain your answer. ...?

Mark me brainiest answer is b

How does natural selection change the frequency of genes or traits over many generations? Biology students conducted an experiment mimicking genetic variation and coloration. Students used different colored beans to represent animals that might be prey: mice, for example. A student in each group was the predator: a hawk. Beans (mice) were randomly scattered on multicolored floor tiles, each color within four tiles. The hawk collected mice (beans) for 10 seconds. Mice not eaten reproduced. Three generations of data a shown in the table.

 Speckled and striped beans (mice) had the best survival rates. Why?

A) They reproduced very rapidly.  

B) Coloration was a form of camouflage.  

C) They mimicked other mice and were spared.  

D) The speckled and striped beans had a wider range.  

ANSWERED AT 16/02/2020 - 06:37 PM


QUESTION POSTED AT 16/02/2020 - 06:37 PM

A.) List one organism classified in kingdom Animalia and one organism classified in kingdom Fungi b.) Describe two similarities between the two organisms. c.) Describe two differences between the two organisms. ...?

A. Kingdom Animalia: Dogs
    Kingdom Fungi     : Molds
B. Both dogs and molds are eukaryotic- multicellular and do not produce their own food.
C. They have different structures when it comes to physical appearance.The major difference between them is their ability to move - animals are capable of free movement while fungi yes they can but not as much as the animals.

ANSWERED AT 16/02/2020 - 06:34 PM


QUESTION POSTED AT 16/02/2020 - 06:34 PM

3 things that the cell is doing during interphase.

1)grows 2)copies its DNA 3)prepares to divide

ANSWERED AT 16/02/2020 - 06:24 PM


QUESTION POSTED AT 16/02/2020 - 06:24 PM

Why do proteins determine the physical and physiological traits?

It is the DNA that determine traits. The pattern of base pairs in the DNA double helix encodes the instructions for building the proteins necessary to construct an entire organism determining physical and physiological traits. Hope this answers the question.

ANSWERED AT 16/02/2020 - 06:14 PM


QUESTION POSTED AT 16/02/2020 - 06:14 PM

Which structure of the respiratory system plays the main role in carry out the system’s primary function? trachea pharynx alveoli nose

Answer:

alveoli

Explanation:

Alveoli are the basic functional units of respiratory system which play actual role of exchange of gases. Alveoli are tiny balloon like air sacs which exist as a single cell not as a group of cells. They are responsible for exchange of gases like oxygen and carbon dioxide in our body. As soon as we inhale with the help of nose, a lot of air full of oxygen first reaches pharynx and then trachea. From trachea it ultimately reaches alveoli. Since alveoli have air full of oxygen so the partial pressure is more at alveolar end while capillaries nearby alveoli have blood which is full of carbon dioxide so the partial pressure of carbon dioxide is more in capillaries. Now, a gradient is set up as a result of which alveoli and blood capillaries exchange oxygen and carbon dioxide passively. Oxygen molecules from alveoli tend to diffuse to capillaries while carbon dioxide molecules from capillaries tend to move towards alveoli. The movement/exchange of gases continues until an equilibrium condition is reached. After which the carbon dioxide is exhaled out of out body with the help of same respiratory tract mentioned above.

ANSWERED AT 16/02/2020 - 05:14 PM


QUESTION POSTED AT 16/02/2020 - 05:14 PM

A group of hikers find a fallen tree in a forest. The dead tree trunk is covered by mushrooms and other fungus. Later, they find a wild apple tree with many apples lying on the forest floor beneath the tree. The apples are all rotten and decayed by bacteria. Which statement BEST summarizes how these fungus and bacteria organisms are obtaining their food energy? A) The fungus and bacteria are both parasitic organisms that obtain food from other living organisms. B) The fungus and bacteria are both obtaining their energy by manufacturing food from minerals and sunlight. C) Both fungus and bacteria require well-fertilized soil in which to obtain nutrients needed for chemosynthesis. D) The fungus and bacteria organisms are obtaining the energy they need by decomposing organic matter like dead trees and old apples. Eliminate

Answer: D. The fungus and bacteria organisms are obtaining the energy they need by decomposing organic matter like dead trees and old apples.

Fungi is the primary decomposer of biological waste in forest ecosystem. Fungi grows on the branching network of hyphae which provide it more penetration potential towards the litter. Wood decaying fungi has enzymes required for decomposition of lignin, a chemical substance found in wood. Fungi decompose organic matter by releasing enzymes which breaks down the decaying matter, after that they absorb the nutrients in the decaying material. The left residue in the organic matter includes sugars and amino acids are degraded and decomposed by the bacteria.

ANSWERED AT 16/02/2020 - 04:05 PM


QUESTION POSTED AT 16/02/2020 - 04:05 PM

Which of the following takes place in meiosis but not in mitosis?1. cell division 2. crossing over3. metaphase 4. spindle fiber formation-I think is #2 crossing over but it would be nice for someone to check.

4. Spindle fiber formation takes place in meiosis but not in mitosis. I think, mitosis is what is behind children growing into adults and what helps heal cuts.

ANSWERED AT 16/02/2020 - 03:55 PM


QUESTION POSTED AT 16/02/2020 - 03:55 PM

What are 2 main functions of flagella and cilia?

Hello! Flagella and cilia assist the cell in moving around. It's somewhat comparable to an arm or leg propelling someone forward when swimming- cells may not have limbs but they have flagellas and cilias

ANSWERED AT 16/02/2020 - 03:36 PM


QUESTION POSTED AT 16/02/2020 - 03:36 PM

Explain how the inside of a cell remains separate from its environment

     Well, first, we need to know the structures of a cell to answer this question properly.

      As you may know, a cell contains lots of different structures with different functions, for example, a ribosome, it is an organelle that makes protein for your body. The inside of a cell is separated then by a plasma membrane made out of phospholipids, it protects the inside of a cell by deciding what gets in and what gets out through proteins attached to it and vesicles. The inside of a cell must be always separated from its environment because of the difference in pH levels most of the times, or even to maintain its functions working properly without outside influences.

ANSWERED AT 16/02/2020 - 03:29 PM


QUESTION POSTED AT 16/02/2020 - 03:29 PM

Science when birds remain airborne and moving without flapping their wings, on what are they gliding?

Soaring is a science when birds remain airborne and moving without flapping their wings. They are maintaining thrust and gliding downward but staying aloft

Further explanation

Soaring birds is where the birds can maintain flight without wing flapping, because they using rising air currents. Many gliding birds are able to lock their extended wings by means of a specialized tendon. Some land birds such as vultures and certain hawks, sustain flight for long periods without flapping their wings.

For example soaring California Condor spreads its primary feathers so that each acts as a small, high-aspect-ratio wing. This reduces turbulence at the wingtips and helping the condor to stay aloft circling slowly in thermals.

Vultures have a low aspect ratio (ratio of length to width of the wing) which generally produce a lot of drag. Vultures overcome the problem of by flying with their primary feathers extended, creating slots between them. Each primary serves as an individual high-aspect-ratio wing. This high-aspect-ratio reducing wingtip turbulence and lowering the stalling speed of the wings. This helps vultures to circle in thermals, maintaining thrust by gliding downward, but staying aloft by sinking at a rate slower than the hot air rising.

Learn more

  1. Learn more about Soaring birds brainly.com/question/4722417

Answer details

Grade:  9

Subject: biology

Chapter:  animals

Keywords:  birds

ANSWERED AT 16/02/2020 - 03:29 PM


QUESTION POSTED AT 16/02/2020 - 03:29 PM

Which is the correct order of processes that occur for water to move from a lake to a cloud and then turn into rain?

That is called "The Water Cycle" Also called the "Hydrologic Cycle". It goes in this order:

1. Run-off/Collection

2. Evaporation

3. Condensation

4. Precipitation

5. then it goes back to run-off

After that, it goes all over again.

Hope this helped! :D I included pictures for you to see a picture of the Water Cycle and to better understand what I was saying. Lol! :D :)

ANSWERED AT 16/02/2020 - 04:50 AM


QUESTION POSTED AT 16/02/2020 - 04:50 AM

On a cloudless night a milky band known as a milky way is visible from earth.Explain how the structure of our galaxy and the position of our solar system within our galaxy relate to this observation

Since we are at the edge of the galaxy, The side of the milky way is visible to us.  However you have to be very far from artificial light.

ANSWERED AT 16/02/2020 - 02:01 AM


QUESTION POSTED AT 16/02/2020 - 02:01 AM

A population that grows until it reaches its carrying capacity usually has the shape of what

The shape of an 'S'

Hope that helps

ANSWERED AT 16/02/2020 - 02:00 AM


QUESTION POSTED AT 16/02/2020 - 02:00 AM

Water's unique properties result from the fact that water

Water has an unusual ability to dissolved other substances  

ANSWERED AT 16/02/2020 - 01:57 AM


QUESTION POSTED AT 16/02/2020 - 01:57 AM

occurs naturally between organisms living in an environment with limited resources. A. Competition B. Symbioses C. Logistic D. Exponential

A.competition would be the correct answer I believe

ANSWERED AT 16/02/2020 - 12:34 AM


QUESTION POSTED AT 16/02/2020 - 12:34 AM

What is the end result of mitosis and cytokinesis? why is this so important?

The end result of mitosis is a cell that is exactly the same as the original cell. So, if you have Cell A and cell A goes through mitosis and produces cell B... Cell B is an exact clone/replica of cell A with NO VARIATIONS. It's literally like cloning (Asexual reproduction).

Cytokinesis is part of the cell cycle, it is the last stage where a plate forms between both the cells to separate them from each other and to form two individual cells. 

Mitosis is important because it is a fast way of producing replicas of cells. Cytokinesis is important to differentiate or create boundaries between the cells. 

ANSWERED AT 16/02/2020 - 12:33 AM


QUESTION POSTED AT 16/02/2020 - 12:33 AM

The selective breeding of wild mustard has _________ _________ and produced at least four other vegetable crops.

The answer you are looking for i believe is "Increased Biodiversity" 

ANSWERED AT 16/02/2020 - 12:24 AM


QUESTION POSTED AT 16/02/2020 - 12:24 AM

Depending on the organism, the number of in a cell may change.

Depending on the organism, the number of ________ in a cell may change.

Answer = Chromosomes

ANSWERED AT 16/02/2020 - 12:23 AM


QUESTION POSTED AT 16/02/2020 - 12:23 AM

Depending on the organism, the number of in a cell may change.

It chromosomes, I just took the assignment.

ANSWERED AT 16/02/2020 - 12:23 AM


QUESTION POSTED AT 16/02/2020 - 12:23 AM

What kind of energy do all cells need to survive

They need ATP to survive

ANSWERED AT 16/02/2020 - 12:15 AM


QUESTION POSTED AT 16/02/2020 - 12:15 AM

One of the major classes of organic compounds?

The four major classes of organic compounds are nucleic acids, lipids, carbohydrates and proteins.

ANSWERED AT 16/02/2020 - 12:14 AM


QUESTION POSTED AT 16/02/2020 - 12:14 AM