the three general classifications are sensory neurons, motor neurons and interneurons. I don't know how they work together to produce a response to an environmental stimulus:( sorry
The number of organsims at each levels, so there are more producer than herbivores, more herbivores than carnivores and so on...
8 protons because a element always has the same number of protons as its atomic number
I would go with false, because not only 100,000 genes, there are lots to those. and there are not even like 100,000 genes, that is not really possible!!
hope that this helps you! =)