The "steady state" or constant condition maintained by the body is called and is necessary for life.

The correct answer for the fill in the blank is Homeostasis.

Homeostasis can be defined as the ability of an organism to keep its internal body conditions as constant. In other words, when a steady state or constant environmental condition is maintained by a body, it is called Homeostasis.

For instance, the body temperature of human beings is . This is maintainted constant due to homeostasis.

Homeostasis is necessary for life as it allows the body to remain healthy with the steady state.

Example- Enzymes, which are very crucial for any biochemical process, require optimum conditions ( temperature, pH) to work efficiently. This is maintained through homeostasis.