How Has the Median Age of First Marriage in the United

question 135

Multiple Choice

How has the median age of first marriage in the United States changed from 1970 to 2009?​

• A) ​It has dropped by about four years.
• B) ​It has remained constant.
• C) ​It has risen by about five years.
• D) ​It has risen by about eight years.

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Definitions:

Repair Enzymes

Enzymes that scan DNA for damage or errors and carry out repairs to maintain genetic fidelity.

Somatic Cell

Any cell of a living organism other than the reproductive cells.

Egg

Female gamete.

Sperm

Male gamete.