True.
there will be more chemicals I.e. neurotransmitters present. e. g. of neurotransmitters is acetylcholine (AcH).
if action is repeated, more neurotransmitters will be synthesized at the axon terminals to be secreted into the synaptic cleft or muscle terminal ends which ends in a response.
The answer is D. quaternary
While cellular respiration releases carbon dioxide into the environment, photosynthesis pulls carbon dioxide out of the atmosphere.
