Which best defines homeostasis? modifying the external environment maintaining a stable internal environment controlling what enters and exits the cell movement of materials into the cell?

(B). maintaining a stable internal environment

The right option is; maintaining a stable internal environment

Maintaining a stable internal environment best defines homeostasis.

Homeostasis is a process by which the body tends to maintain a constant and balanced internal environment which requires adjusting to conditions and changes. Examples of homeostasis include the maintenance of body weight, and the human body temperature which is mostly around 37 degrees Celsius.