Read each example and decide wheather each would increase or decrease the genetic variation in the gene pool of that population. A zebra migrated to join a different herd of zebras. Competition for sunlight leads to taller trees. The DNA of a snake changes to make its venom stronger. A grassfire randomly sweeps through a population of buffalo and kills most of the animals.

The correct answer is to break down acetylcholine.

Acetylcholine esterase is an enzyme found in the synaptic clefts of the nervous system and it functions to terminate the action of acetylcholine by breaking it down to acetyl-CoA and choline, rendering the neurotransmitter functionless. Choline and acetyl-CoA will then go back to the presynaptic neuron by reuptake and acetylcholine will be formed again inside the neuron.