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    Life The Science of Biology Study Set 1
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    Exam 44: Animal Development
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    The Gray Crescent
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The Gray Crescent

Question 72

Question 72

Multiple Choice

The gray crescent


A) is observable in the frog zygote.
B) develops at the site of sperm entry.
C) causes rotation of the cortical cytoplasm.
D) induces formation of the optic cup.
E) can be mimicked by retinoic acid.

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