A"stressor" is defined as a. a trigger that causes a stressful reaction b. the nonspecific response of the body to any demand made on it c. a negative emotion resulting from environmental unpleasantness d. the physiological reaction of the body to environmental factors

A "stressor" is defined as a trigger that causes a stressful reaction.

Option A

Explanation:

A stressor is a substance or natural operator, ecological condition, outside upgrade or an occasion that makes pressure to a living being. Mentally, a stressor can be occasions or conditions that an individual would think about requesting, testing, and additionally compromise the person's security.

Stressors have physical, chemical and mental reactions within the body. Physical stressors produce mechanical weights on skin, bones, tendons, ligaments, muscles, and nerves that reason tissue twisting and in extraordinary cases tissue disappointment. Compound burdens additionally produce bio-mechanical reactions related to digestion and tissue fix. Physical stressors may deliver torment and hinder work execution.

the answer is cell division : )