A feature that only mammals have is:
a. predatory behavior.
b. internal skeleton.
c. bilateral symmetry.
d. a skeleton of calcium carbonate.
e. hair.
Answer: e. hair.
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a. a. a fruit; a seed b. an embryo; a fruit c. a seed; an embryo d. a female gametophyte; a seed e. a fruit; a female gametophyte
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