GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If the weather becomes extremely hot, the elephants can grow longer ears immediately.
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If the weather becomes extremely hot, over several generations more elephants will have larger ears.
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Either A or B
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None of the above
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Detailed explanation-1: -Elephant ears are full of large blood vessels, which you can actually see on the back of their ears. As blood circulates through the vessels in the ear, it cools down and then circulates into the rest of the body, which helps cool the entire elephant down.
Detailed explanation-2: -Elephants do many different things with their big ears. One thing is that they can cool themselves down when they are hot. The blood flowing through the ears is close to the outside of the elephant body, and heat can be released as they flap them about.
Detailed explanation-3: -Large ears of elephants help to keep them cool and hear very soft sounds. The good sense of hearing help them to escape from their predators.
Detailed explanation-4: -Each ear has a lot of tiny blood vessels that are close to the surface. If an African elephant needs to cool down, they flap their ears to create a breeze and cool down their blood supply efficiently. Their blood vessels can also dilate to increase the flow of blood to their ears and increase cooling.