Answer:
I think it's A correct me if am wrong am not that smart am sorry if am wrong
A stimulus is the enviromental factor that causes a chang in position or place while a response is the change made caused by the stimulus
An environment is the surroundings or conditions in which a person or any living thing lives.
It would be answer 1 nucleus
A)animal cells must be in osmotic equilibrium with their surrounding environments, because if they swell or shrink their membranes will rupture.
