Humans, mice, and giraffes have seven vertebrae in their necks. What can scientists conclude from this observation?

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Responses

All vertebrates have seven vertebrae in their necks.
All vertebrates have seven vertebrae in their necks.

Each animal independently evolved this trait.
Each animal independently evolved this trait.

Humans, mice, and giraffes have the same number of bones.
Humans, mice, and giraffes have the same number of bones.

These animals descended from a common ancestor.
These animals descended from a common ancestor.
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Answer 1

These animals likely descended from a common ancestor. This is because the shared trait of having seven vertebrae in their necks suggests that this characteristic was inherited from a common ancestor and has been conserved through evolution.