The testes are in/outside of the body cavity.

The testes are outside the body cavity.

Explanation:

Testes, also called Testicles, are the male reproductive glands which are responsible for producing sperms and androgens, mainly testosterone. They are present in the scrotum outside the body.

The process of spermatogenesis requires a temperature lower than the temperature of the body (37 °C) to produce viable sperm. Therefore, the testes are located outside the body to maintain the temperature at 35°C.