The hind leg bones of a whale is an example of a _________ structure

_________ structures evolve in different species when environmental pressures are similar.

This graphic illustrates that the heart of a human and turtle are _________ structures.

Homologous structures necessarily have the same function.

Bat wings and butterfly wings are both adapted for flight, but evolved separately. Bat and butterfly wings are _________ structures.

What is is the study of how and why plants and animals live where they do?

The fossils on the layers closest to the top are the ____________.

Which statement is best supported by the observable structures of the different humerus bones?

Which of the following is an example of a trace fossil?

Sharks and dolphins are very different organisms even though they look alike. The process in which unrelated organisms evolve to resemble each other is ___________.