Answer:
Acetylcholine
Explanation:
Acetylcholine (ACH) is a neurotransmitter hormone produced by the nervous system (central and peripheral), which is released by the motor nerve endings in the muscle. It is a simple molecule produced in the cytoplasm of nerve endings, being derived from choline (component of lecithin), which arises from its reaction with acetyl-CoA in the presence of the enzyme choline acetyl transferase (ChAT).
This hormone acts in various parts of the body as a messenger between nerve cells, and its main effects are on the cardiovascular system, excretory system, respiratory system, muscle system and the brain.
A, the independent variable is the thing you change, the dependent is the variable you measure.
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Explanation:
they all have a highly developed brain
B is your answer all of the above
