The reason why a woman's chance of having dizygotic twins increases as the woman gets older is that
A. it becomes easier for a sperm to penetrate the outer shell of the ovum.
B. as the woman's ovaries decline in their ability to release eggs, her production of hormones increases to counter this decline.
C. the lining of the uterus becomes more receptive to implantation of the blastocyst.
D. her risk of miscarrying an early pregnancy significantly decreases.
Answer: B
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