Gastrulation ________.
A) produces a solid ball of cells
B) changes the blastocyst into an embryo that has three tissue layers
C) changes the fertilized egg into a blastocyst
D) changes a gastrula into a blastocyst
Correct Answer:
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Q24: Female fertility could be severely decreased by
Q25: Cleavage results in _.
A)formation of the nervous
Q26: The liver, pancreas, and lining of the
Q27: At about what point in gestation does
Q28: What is gestation?
A)conception
B)fertilization
C)development
D)pregnancy
Q30: What action might increase the number of
Q31: Which substance stimulates contractions in uterine smooth
Q32: Which of these events occurs first?
A)gastrulation
B)cleavage
C)implantation
D)formation of
Q33: The "grandmother hypothesis" suggests that natural selection
Q34: Which situation is NOT a legal or
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