Question

Define Stimulus ????​

Answer 1

Answer:

In physiology, a stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity

Answer 2

Answer:

a thing or event that evokes a specific functional reaction in an organ or tissue.

"areas of the brain which respond to auditory stimuli"

a thing that arouses activity or energy in someone or something; a spur or incentive.

"if the tax were abolished, it would act as a stimulus to exports"

Explanation:

$mark \: me \: as \: brainliest$