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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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ppk ppk
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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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bio_manbio_man
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12 years ago
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