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3 years ago

Which example of artificial selection is caused indirectly by human activity?

2 answers:

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The artificial selection is a procedure of selectively breeding certain species of plants and animals in order to develop certain desirable traits. Artificial selection helps the humans to get the plants or livestock that are the most useful for them. Among the given options, the choosing of the sheep giving the most wool, mating of the goats producing more milk, and mating of the ducks to produce large eggs are all examples of the deliberate artificial selection.

But the using of the fishing nets that are catching only the large crabs is an example of indirect artificial selection as it leads to the increased population of small crabs.

Hence, the correct answer is 'option d'.

nika2105 [10]3 years ago

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Answer;

D.) increased number of small crabs because fishing nets catch mostly large crabs

Explanation;

-Artificial selection is a form of selection in which humans actively choose which traits should be passed onto offspring. Humans have used selective breeding long before Darwin's Postulates and the discovery of genetics.

-Farmers chose cattle with beneficial traits such as larger size or producing more milk, and made them breed; and although they may have known nothing about genes, they knew that the beneficial traits could be heritable. The farmers selected for certain traits in their cattle and probably noticed that the offspring were becoming more and more productive with each generation.

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This type of membrane transport moves substances against the concentration gradient from an area of low concentration to an area

sashaice [31]

Answer:- Active transport

Explanation:-

There are two types of membrane transports

1. Passive transport - this type of transport occurs without the input of any energy and the molecules move along the concentration gradients that is from high concetration to low concentration.

2. Active transport- this type of transport takes place to move the molecules against the concentration gradient that is from low concentration to high concentration.

The active transport is of two types:

1. Primary active transport- in this type of transport ATP is used as an energy source to move the substances against the concentration gradient.

2.Secondary active transport - in this type of transport the gradient formed by the active transport is utilized and it involves the movement of 2 substances at a time aross the membrane. That is the movement of one molecule is coupled to another.

The membrane proteins that are associated with active transport are called as carrier proteins. These proteins have a binding site for the molecules that they transport. Once they bind to the specific molecules, a conformation change is induced and this leads to the transport of the molecule across the membrane.

So, the active transport is basically responsible for utilizing the energy from ATP and carrier proteins to move the substances across the membrane against their concentration gradient i.e. from low concentration to high concentration.

5 0

2 years ago

What causes people to get sick from E. coli, and what would the symptoms be? Also, how can people avoid eating contaminated food

Lunna [17]

ANSWER FOR QUESTION 1:

The most common type of E. coli infection that causes illness in people is called E. coli O157, which produces a toxin known as Shiga-toxin. Shiga-toxin producing E. coli is abbreviated as STEC. Symptoms of infection with this germ include watery or bloody diarrhea, fever, abdominal cramps, nausea, and vomiting.

ANSWER FOR QUESTION 2:

Some other germs don’t cause as many illnesses, but when they do, the illnesses are more likely to lead to hospitalization. Those germs include: Anyone can get sick from eating contaminated food. Follow four simple food safety steps —clean, separate, cook, and chill—to lower your chance of food poisoning and to protect yourself and your loved ones.

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2 years ago

The relationship between the bacterium xenorhabdus nematophila and its nematode host is

Vedmedyk [2.9K]

Answer:

The correct answer is - mutualistic.

Explanation:

The symbiosis or relationship between the bacterium xenorhabdus namtophilia and Steinernema carpocapsae, the nematode host is known as mutualistic or the cooperation in between them. Both the organisms live in a symbiosis in which both are benefited.

The nematode lives free till the early infective juvenile stage only. Bacterium present in both conditions as individual and with the symbiosis of the host.

Thus, the correct answer is - mutualistic.

8 0

2 years ago

Proteins are made in the mitochondria of cells, T of F? Proteins make up our blood, hair, skin, heart, muscles, and bones, T or

pogonyaev

First false, and second true.

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2 years ago

Read 2 more answers

A local farmer began to follow a more sustainable practice. as a result, his levels of carbon emissions decreased by fifty perce

nadya68 [22]

Increase.

Unless there is more information missing from this passage; the quality of soil will increase as sustainability increases. With a lack of additions from foreign substances, the earth shall regain its initial strength to grow whatever crop.

7 0

1 year ago