During embryonic development in vertebrates, which of the following characteristics are shared by all vertebrate animals?
(a) pharyngeal pouches
(b) postanal tail
(c) 4 limbs
(d) warm bloodedness
(e) live birth
Answer: A & B.
(a) pharyngeal pouches
(b) postanal tail
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From what kind of molecules are nonsteroid hormones made?
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Fill in the blank(s) with the appropriate word(s).