social studies

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The number of multiple births (twins, triplets, etc.) has grown rapidly in the United States since 1980. The main reason for this increase is that:
A. studies show that people are having more frequent intercourse.

B. less frequent intercourse has resulted in higher sperm counts.

C. more teenagers are having sex.

D. more women have been using fertility drugs

My answer is D.

  • social studies -

    Absolutely right!

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