The answer is C. Maybe im not sure
The stimuli plants respond to will be found in the environment. Example....plants grow towars the sun.
Because the chain will begin to shut down and will no longer pump [H+] (hydrogen ions) across the membrane; thus, the proton gradient can not be maintained.
:) I hope this answers your question!
The answer to your question is t<span>he signal travels through the nerve of the hand to the spinal cord and then to the brain.
Hoped I Helped!</span>