What is the ability of an organism to change internally or externally to changes in the environment is called

Homeostasis

Explanation:

This is the ability of an organism to maintain constant conditions in  the internal to the external environments. The most important conditions of the internal environment that must be kept constant include: osmotic pressure of blood, blood sugar, temperature and metabolic wastes.

Homeostasis can be maintained in the body through sweating to regulate temperature, lowering of hair, vasodilation of superficial blood vessel and animals living in very cold habitats have a particularly thick layer of subcutaneous fat which prevents heat loss

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