Mark was pretty aggressive when he was in his early twenties. At the drop of a hat he became angry and was quick to act violently. Now Mark is 60 years old and is much calmer than he was back then. Mark's levels of the hormone have .

His testosterone levels decreased.

Explanation:

Mark's levels of the hormone testosterone have decreased.

an aneroid barometer is different from a mercury barometer in that it provides readings that increase as air pressure increases.

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your answer would b. the missisipi river

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