How does comparative anatomy support then idea that organisms share ancestors?

Answer 1

Comparative anatomy does not prove evolution itself, but is strong evidence because it shows that animals and species do change through periods of time; if evolution were not so, there would be no comparison possible since they would either be exactly the same or they would be different species.

Answer 2

It shows the likelihood of an evolutionary ancestor. For example, the human spine curvature suggests that we used to walk on all fours, like a gorilla. This coupled with the other evidence is what is predicted would exist if we evolved from a common ancestor.

We also see this in how our bipedal movement works, how our jaws and teeth match, where we have hair...

We also see this in other animals' vestigial structures such as the bones in whale fins.

Answer 3

Comparative anatomy is the evidence that two different phylums of animals have similar structures. This is basically evolution saying, "Hey, it works, so it will thrive!" These similarities are usually accounted for by the theory of a common ancestor, also a point in evolution.

Answer 4

when scientists compare body structure, they see some similarities or that organisms share traits.

Answer 5

Comparative anatomy argues that organisms with similar structures must have acquired these traits from a common ancestor. This supports the theory of evolution.