Evolutionary History 1.2 (2/14) Exit Ticket

The snake and rat are different species, so they must not be related. They inherited the quadrate bone structure from separate ancestor populations.

All species have their own specific body structures, so it is a coincidence that the snake and rat each happen to have the quadrate bone structure.

The snake and rat both share the same ancestor population that had a quadrate bone. They inherited this structure from the ancestor population.

It is impossible to say. Fossils are very old; therefore, we cannot make observations of the snake’s ancestors, and we cannot explain its body structures.

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