The average age at which Americans first have sexual intercourse is

A. 13.
B. 15.
C. 17.
D. 19.


C. 17.

Health & Biomechanics

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Lactation is the process by which the mammary glands produce milk.?

Indicate whether the statement is true or false

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What daily choices contribute to your carbon footprint?

What will be an ideal response?

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According to Lazarus's research, what are daily hassles and what role, if any, do they play in the production of stress?

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Which of the following is TRUE about target heart rate?

A) It is a measure of the heart rate after 20 minutes of exercise. B) It is a percentage of your maximum heart rate. C) It is the threshold level of exercise at which one cannot talk and exercise comfortably. D) It varies by a person's body weight.

Health & Biomechanics