A condition or event in the environment is called a stimulus
Stimulus can be regarded as detectable change, this change could be physical or chemical change that occur in the environment of one organism or the other which brings some functional activity as a result of the change.
stimulus can also be regarded as act of nature as well as act of environment which takes place on organism that brings about activation(stimulation) of it to react in some way.
There are external stimulus and internal stimulus
For example, sunlight can be regarded as stimulus for plants which enable them to grow
Another example of stimulus is high temperatures can be regarded as (stimulus) for the perspiration system in body of human.
After rain has falling, frogs will come out from different area and start jumping, here the rain can be regarded as a stimulus for the frog
Therefore, stimulus is condition or event in the environment
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