Information in the environment that causes an animal to react is
a. a control.
b. an interneuron.
c. a response.
d. a stimulus.

The correct answer to your question is:

D. stimulus.

I hope I have helped

the correct answer is:

a population changes in response to a change in the environment.

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.