Biology

The correct answer is: A.Homeostasis

Explanation:

Homeostasis refers to the ability of an organism or cell to maintain a stable internal environment despite changes in external conditions. This includes regulating factors like temperature, pH, ion concentrations, and water balance, ensuring that cells can function optimally.

The other options are not related to maintaining a stable internal environment:

B.Endocytosis: A process where cells take in substances by engulfing them in the membrane, which is a form of ...