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OpenStudy (adamconner):
Identical ( not faternal) twins originate from the fertilization of A)a single egg cell by two sperm cells. B)a single egg cell by a single sperm cell. C)two egg cells by a single sperm cell. D) two egg cells by two sperm cells.
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OpenStudy (anonymous):
B
OpenStudy (praetorian.10):
for identical twins, these happen when a single egg is fertilized by a single sperm
OpenStudy (anonymous):
C
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