High levels of the hormone are produced in which some scientists speculate may lead to differences in male and female brain structure and later variations in gender-related behavior(s).

androgen; males

Explanation:

Androgen is any natural or synthetic hormone which increases the male characteristics in a body. In humans the androgen is testosterone.

Testosterone is an anabolic steriod and the main male sex hormone. It has an important role in the development of the testes and prostate.

In the fetus of male brain aromatization of testosterone to estrogen occurs. This enters the male brain after crossing the blood–brain barrier.

In the fetus of the female brain α-fetoprotein is present which causes the estrogen to bind and does not affect the main brain.

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clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

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