The sac that regulates the temperature of the testes is the

The scrotum is the sac that regulates the temperature of the testes and maintains its at 35degrees celsius. This temperature is 2 degrees lesser than that of the normal body temperature because, at higher temperatures, the process of spermatogenesis is affected.  Temperature regulation is done by the smooth muscles of the scrotum.

the difference between prokaryotic and eukaryotic is that prokaryotic cells have no nucleus while on the other hand eukaryotic cells have very much nucleus...

Explanation:

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