What is meant by "homeostasis" in biological terms?

Homeostasis refers to the processes by which living organisms maintain a stable internal environment despite external changes. This stability is crucial for the proper functioning of cells and overall health of the organism. Homeostasis involves various physiological mechanisms that regulate parameters such as temperature, pH, and concentrations of ions and nutrients.

For instance, in humans, mechanisms such as sweating to cool down or shivering to generate heat illustrate homeostatic processes. The body constantly monitors internal conditions and makes adjustments to maintain equilibrium, which is essential for survival. This concept is fundamental to understanding how organisms function optimally in changing environments.

While the other options touch on important aspects of biology, they do not capture the essence of homeostasis. Inability to adapt reflects a lack of homeostatic mechanisms, and growth and development as well as reproduction are processes that may occur under various internal states but do not define the maintenance of a stable internal environment.