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ppk ppk
wrote...
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Posts: 3561
12 years ago
In all vertebrate animals, development requires     
A) an amnion.
B) a large supply of yolk.
C) a primitive streak.
D) an aqueous environment.
E) extraembryonic membranes
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Answer accepted by topic starter
bio_manbio_man
wrote...
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Posts: 33243
12 years ago
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