What traits do all organisms with no internal themoregulation have?

A Ectothermy

B Epidermthermy

C Exothermic

D Endothermy

The correct answer is A.

Explanation:

Ectothermic is the main characteristic of a group of living beings that are not capable of generating, by metabolic or physiological processes, their own internal heat. These organisms must rely on external heat sources to reach certain body temperature. When the environmental temperature is not the appropriate one, they must take care of their activity in order to save energy.

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Ectothermy and Endothermy