What is the name of the process which controls the internal temperature?

This process that controls the internal temperature is thermoregulation. It is important for the internal environment of the body to be controlled and maintaining it constant a process called homeostasis. The nervous system and the hormones are responsible for this. Temperature in the body is controlled to maintain an optimum temperature for enzyme activities, which is controlled  by controlling blood flow to the skin (vasodilation and vasoconstriction), sweating, and shivering

Covalent bond is the correct answer