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ppk ppk
wrote...
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Posts: 3561
12 years ago
A primitive streak forms during the early embryonic development of     
A) humans, but not birds or frogs.
B) humans and birds, but not frogs.
C) frogs, but not birds or humans.
D) birds, but not frogs or humans.
E) birds and frogs, but not humans.
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wrote...
12 years ago
B
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