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Posts: 3561
12 years ago
In humans, identical twins are possible because     
A) of interactions between extraembryonic cells and the zygote nucleus.
B) the gray crescent divides the dorsal-ventral axis into new cells.
C) of convergent extension.
D) early blastomeres can form a complete embryo if isolated.
E) of the heterogeneous distribution of cytoplasmic determinants in unfertilized eggs.
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Educator
12 years ago
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