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What external layers must a sperm penetrate in order to fertilize the egg?
Q7: The embryo of a undergoes direct development.<br>A)
Q30: After the mature follicle releases the egg,
Q42: In seeds from northern areas, what plant
Q44: John was attending a party when he
Q49: Water loss through the stomata of leaves
Q57: How do undifferentiated cells "know" what to
Q77: Increased levels of stress and trauma may
Q84: Which of the following attaches one bone
Q90: The increased levels of estrogen from the
Q90: If a cell contains large amounts of