Metamorphosis is
A. the developmental changing of a scale to a feather.
B. changing of one body form to another within a species, such as the change from an aquatic tadpole to a terrestrial frog.
C. an intermediate condition, such as length of legs in mice between longer legs of some mice and shorter legs in others, a condition caused by Hox genes.
D. the evolutionary transition from fishes to amphibians.
Answer: B
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