I think your best options here are
15) opioids
16) anabolic steroids
Opioids mimic the natural structure of a neurotransmitter
Anabolic steroids are synthetic testosterone
Answer:
some of the most essencial vitamins are A, C, D, E, K, and the B vitamins: thiamin (B1), riboflavin (B2), niacin (B3), pantothenic acid (B5), pyridoxal (B6), cobalamin (B12), biotin, and folate/folic acid. some of the most essencial vitamins are calcium, chloride, magnesium, phosphorus, potassium, sodium, and sulfur.
A seesaw is an example of a first class lever The fulcrum, which is the part of the lever that does not move, is in the middle. The resistance, which is the weight (person) you are trying to lift is at one end. The effort, which is the force applied to the lever, is the person sitting on the other end.
Answer: Fluid :) Hope this helps!