What biological process allows humans to maintain high body temperature?

Homeostasis.

Explanation:

Homeostasis is the process of maintenance of the constant internal body temperature. This process is controlled by thermoregulatory centre which is contained in the hypothalamus in the brain. The nervous system and hormones are responsible for this process.

Humans, birds and all mammals areendotherms which means they are animals who maintains a constant or stable body temperature by generating the heat.

When temperature rises up, the body reacts by increasing blood flow to the skin surface, taking the heat from the body to the surface. As the sweat evaporates, and body cools down.  

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

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