Parkinson’s disease is a caused by the degeneration of neurons that release
serotonin
dopamine
glutamate
norepinephrine

dopamine

Explanation:

The main cause of Parkinson's disease is the death of brain cells, especially in the area known as substantia nigra, responsible for the production of dopamine, a neurotransmitter that, among other functions, controls movement. This is a chronic, progressive neurological disease with no known cause that affects the central nervous system and impairs movement. The older the age, the higher the incidence of Parkinson's disease. According to statistics, in the vast majority of patients, it appears from 55, 60 years and its prevalence increases from 70, 75 years.

b. heterotroph

explanation:

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /