Give scientific reasons: Testis are located in the scrotum outside the abdominal cavity.

(N/A) The process of spermatogenesis,which involves the formation of spermatids and spermatozoa,requires a temperature approximately $2^{\circ}C$ to $3^{\circ}C$ lower than the normal internal body temperature.
This lower temperature is essential for the viability and proper functioning of the germinal epithelium in the testes.
The scrotum acts as a thermoregulatory organ,maintaining the testes outside the abdominal cavity to ensure this cooler environment,which is necessary for successful sperm production.