The process in living organisms that produces heat is called thermogenesis.

Here's a breakdown:

* Thermo refers to heat.

* Genesis means creation or production.

Thermogenesis is a biological process where organisms generate heat through metabolic reactions. This process is crucial for maintaining body temperature, especially in animals that are endothermic (warm-blooded).

Here are some examples of how thermogenesis occurs:

* Shivering: Involuntary muscle contractions that generate heat.

* Non-shivering thermogenesis: Increased metabolism in brown adipose tissue, a specialized type of fat that burns calories to produce heat.

* Hormonal regulation: Hormones like thyroxine and adrenaline can stimulate thermogenesis.

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