A scientist studies a species of bird. The males and females look very similar
in color, but the males are much larger than the females. What can the
scientist conclude about these birds?
O
A. The males compete to fertilize.
O
B. The birds reproduce asexually.
O
C. The females choose mates.
O
D. The males choose mates.

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except