21. The eyes of some animals point in the same direction as do those of humans,

Question

21. The eyes of some animals point in the same direction as do those of humans, but in other animals (such as birds) the eyes are positioned more laterally so they point in different directions. What would be the selective advantages of these different anatomical arrangements, and what kinds of animals would you expect to have one or the other? Answer: 22. Stand with your arms held out at right angles to your body for as long as you can. Which will fatigue first: your shoulders or your legs? Why? What does this tell you about the muscles of your shoulders and legs? Answer:

Explanation / Answer

21

Selective advantage about these two types of eyes is that some animals need to visualize and need to have a idea of distance and depth ex for a monkey needs to be detect about the distance between tree branches in search of their food other this type of vision is called binocular vision. This is course of evolution and adaptation mostly predator animals have this type of vision

On the otherhand lateral eyes have a advantage of having a large paripheral vision. They can accomodate large area. This type of vision is basically for prey so that they can detect the risk nearby their large surrounding area to know about if predators is present. This vision is in grazing animals like goat deer etc.

22

According to physics the formula for workdone

F.s.cos

The workdone on legs is zero as distance is small and athe angle is 90

But for workdone on shoulder distance is equal to height of indiviual and direction is paralled to force it gives a lever system .

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