The fossil trilobite was originally:

The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor?

One of the following has not been produced from wild cabbage by the process of artificial selection. This one is:

One pair of organs in the following animals is not homologous. This is:

A. Forelimbs in humans and lizard

B. Forelimbs in lizard and frog

C. Wings in butterfly and bat

D. Wings in bat and bird

The wings of a housefly and the wings of a sparrow are an example of: