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gavmur [86]
3 years ago
6

Do you think these fish are an example of natural selection among two populations of the same species? Explain your answer.​

Biology
2 answers:
Tema [17]3 years ago
7 0

Answer:

It depends on the fish (I do not see any pictures) Any fish is an example of natural selection.

Explanation:

A good example would be that polar bears grew and evolved to have white fur to blend in the snow to sneak upon prey. However, their brown bear counterparts failed to do that. So due to better camouflage and hunting technique, the polar bears survived more up north.

dezoksy [38]3 years ago
7 0

Answer:

The two fish are of the same species because they can mate with each other. Also, the characteristics of the blind cave fish enable them to live in caves. Eyes need energy. So, developing bodies with no eyes allowed these fish to function more efficiently.

Explanation:

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The neural signals that result from the processing of visual input in the retina converge on the _______ cells.
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What would happen if you sweat while your body was cold?
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Answer:

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Explanation:

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The opening of which of the following types of ion channels will lead to a depolarization? A chemically gated sodium channel 2)
nikitadnepr [17]

All of them will lead to depolarisation.

<h3><u>Explanation</u>:</h3>

Depolarisation is a phenomenon ebochor occurs in the excitable tissues of our bodies, namely the neurons and the muscle T junctions. Here the membrane is already polarised by means of difference in charges as well as concentration of ions on both sides of the cell membrane. With a single stimuli, this change in concentration is gone, and this is de polarisation.

This phenomenon occurs because of the opening of the ion channels like potassium channels and sodium channels which leads to a diffusion of ions from both sides to the other achieving a more or less equal concentration on both sides of cell membrane.

Now this opening of the ion channels can be triggered by means of different stimuli. In case of neurons, the opening of the post synaptic ion channels are guided by the chemical impulse taking in synapse.

In case of inter neuron transfer, the ion channels open due to change in voltage of the previous part of the axon.

In case of organ of Corti, the sodium channels open due to mechanical events occurring inside cochlea. So ion channels can open in any form will lead to change in potential.

6 0
3 years ago
Which statement accurately describes Binary star system ?
ZanzabumX [31]

Answer:

The accurate description for the binary star systems are that they have stars that might appear to wobble and also, often have one star that is brighter than the other. The binary star systems are often refer to as the double star system which consists of only two star in the system.

4 0
3 years ago
If, and only blood sugar levels rise past a certain point, the cells will release a hormone called insulin. Insulin acts as a/an
lakkis [162]

Answer:

When blood glucose level rises beyond the threshold levels, the pancreas secrets hormones insulin. The latter ensures entry of  glucose into the cells through Glut transporters for cellular utilization, therefore reducing the blood levels., and promotes storage as glycogen in the liver and muscles.  

How ever if  the glucose levels drops below the  set point, an hormone glucagon is also produce by the pancreas to cause the liver o withdrawal and breakdown glucose storage as  glycogen back to glucose thus raising the blood glucose level back to the normal levels.

This is an example of negative feedback mechanism, because the increase in the input levels (blood glucose levels) brings about a counter  mechanisms (insulin secretions)as output , to reduce the  elevated   levels by promoting  entry into the cells,, thus bringing the levels to threshold levels.

Thus insulin is acting in a negative feedback mechanism to control blood glucose levels

Explanation:

6 0
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