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13 years ago
A sea urchin zygote undergoes its first cell division     
A) 30 minutes after fertilization.
B) 5 seconds after fertilization.
C) 4 hours after fertilization.
D) 90 minutes after fertilization.
E) 24 hours after fertilization.
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wrote...
13 years ago
"The first cell division occurs approximately 60-90 minutes after fertilization" from http://www.cas.vanderbilt.edu/bsci111b/embryo/embryo.htm
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