When a Scientist Describes the "Body Plan" of a Phylum

Multiple Choice

When a scientist describes the "body plan" of a phylum, he or she is implying that ________.

A) organisms direct their own evolution in order to maximize their success
B) animals evolve according to a pre-ordained plan
C) the body shapes we see now have been more successful than others in the past
D) mutations have arisen that allow only some shapes to be produced