Which of the following is a neurotransmitter often associated with feelings of well-being and happiness that also plays a role in digestion?

Serotonin

Explanation:

It a a nerve chemical produced by nerve cell. It is found in the digestive system, blood platelets and  all other the central nervous system. The essential amino acid used it production is tryptophan which is found in  nut cheese and other food. It helps with sleep cycle eating and digestion. It is helps reduce depression, manage anxiety, healing of wounds and feelings of well-being and happiness

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx