The ability of an organism to change internally or externally in relation to changes in the environment is called reproduction complexity heredity homeostasis

The correct answer is homeostasis.

Explanation:

Change in an organism internally or externally according to environmental change is called homeostasis. This ability help organism to maintain and regulate equilibrium to the outer environment to keep their vital function. There are many regulating organs or glands that help in maintaining homeostasis.

Hypothalamus located in the brain is the major organ that helps in regulating homeostasis. The homeostasis action involves common things are body temperature, blood pressure regulation and many more. however, in lower life forms, it can be regulated by localized organs or cells too.

Thus, the correct answer is homeostasis.

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