Which of the following structures are gonads?
a) seminal vesicles.
b) vas deferens.
c) prostate gland .
d) testes.
e) a, b and c are correct

D) testes

Explanation:

Gonad is also known as a sex gland or a reproductive gland. It is a gland that primarily produces both sex cells and sex hormones.

In females,  

The reproductive cells are egg cells that are produced by the ovary.

In males,  

The reproductive/sex  cells are the sperms that are produced by the testes in the form of spermatozoa.

Seminal vesicles, vas deferens, prostate gland are parts of male reproductive system and are not gonads. They do not produce sperms.

Option D is correct.

answer: the answer is d.

explanation: this is because when you exercise you make your muscle produce a certain liquid, that does not evaporate it.   also when you exercise you do not reduce muscle fiber.   and it does not really control your twitch that much.

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