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Question

Question
In studying humans, whales, and horses, which of the following set of similarities would be evidence for the most recent common ancestor?(1 point)
Responses

they all have hair.
they all have hair.

they all have internal skeletons.
they all have internal skeletons.

they are all mammals.
they are all mammals.

they all have similar bones in their limbs.
they all have similar bones in their limbs.
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Answer 1

To identify the set of similarities that would provide evidence for the most recent common ancestor among humans, whales, and horses, we can evaluate the options:

1. They all have hair. - This is a characteristic of mammals, but it does not encompass all mammals or help to trace a more recent common ancestor.

2. They all have internal skeletons. - This is a trait shared among vertebrates but is not unique to mammals.

3. They are all mammals. - This shows that they share a broader classification, which indicates a common ancestor among mammals, but it's still not the most specific trait that shows a close recent ancestor.

4. They all have similar bones in their limbs. - This is a more precise comparison that reflects evolutionary relationships specific to tetrapods and could point to more recent adaptive changes in limb structure.

The best response that would provide evidence for the most recent common ancestor of humans, whales, and horses is:

They all have similar bones in their limbs.