Structures as different as human arms, bat wings, and dolphin flippers contain many of the same bones, these bones having developed from very similar embryonic tissues. How do biologists interpret these similarities?

By predicting that the organisms have originated from a common ancestor

Explanation:

In the given case, the bones of the arms of the human, the flippers of the dolphin and the wings of a bat are similar in their structure.

This similarity is structure shows that at some point in time they could have shared a common ancestor. Although these structures performed different functions they are similar in their appearance. Such structures are known as homologous structures.

Thus, By predicting that the organisms have originated from a common ancestor is correct.

i'll try what topic lol

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.