Scientists distinguish whether an entity is a living or nonliving by describing of life.

the correct answer would be- characteristics of life.

Explanation:

Distinguishing an entity as a living entity or nonliving entity scientifically is not based on one single thing or character. It is determined by the various characters of life.

The characteristics of life that are helpful in finding out if an individual entity is living or non-living are-

Homeostasis ability,

ability to use energy and obtain it,

Ability to reproduce,

Complexity,

Movement,

Metabolism, and

Heredity.

Thus, the correct answer is - characteristics.