What connects neurons and what chemicals neurons communicate

synapse and neurotransmitters be cautious on the spelling because if spelled incorrectly its marked wrong.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

it is because according to the process , scientific inquiry is a process with many steps because each step occurs to the scientist and if you just skip a step there would be no steps to scientific inquiry.