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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
~Live well, laugh often, and love with all of your heart!~
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