Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

[EX Q]: Question: When two haploid gametes unite during fertilization they form what? Answer: a diploid cell
[EX A]: diploid cell that forms when two haploid gametes unite during fertilization.

[EX Q]: Question: Living organisms are comprised of organic compounds, which are molecules built around what element? Answer: carbon
[EX A]: Living organisms are comprised of organic compounds, molecules built around the element carbon.

[EX Q]: Question: What do you call the zone in a body of water where there is too little sunlight for photosynthesis? Answer: aphotic zone
[EX A]:
Neurons are usually classified based on the role they play in the body. Two main types of neurons are sensory neurons and motor neurons.