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12 years ago
In humans, identical twins are possible because     
A) the gray crescent divides the dorsal-ventral axis into new cells.
B) extraembryonic cells interact with the zygote nucleus.
C) cytoplasmic determinants are distributed unevenly in unfertilized eggs.
D) convergent extension occurs.
E) early blastomeres can form a complete embryo if isolated.
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12 years ago
B
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mrjohnstonmrjohnston
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12 years ago
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