Look at some up some videos about like eureka math or khan Academy
Answer:
All organic molecules are made up of carbon compounds so we can say that the main atom or molecule is carbon.
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Neurotransmitters, such as acetylcholine--the major neurotransmitter found in the human body, act over a short time and they are quickly removed from the synapse by enzymes (i.e. acetylcholinesterase which breaks down acetylcholine to acetyl-CoA and choline).
During interphase, cell growth occurs
A hypothesis is an expectation of what you are going to investigate. So B and D are canceled C has nothing to do with climate So the only remaining answer is A