This popular drug alters consciousness by blocking the reuptake of dopamine and increases its release, and in the long term, it can cause considerable damage throughout the brain and body.
a. marijuana
b. mdma
c. meth
d. heroin

Meth

Explanation:

Meth is a stimulant that affects the "Pleasure Reward Pathway" by altering the reuptake of the neurotransmitter dopamine, consequently leaving an excess dopamine in the synapse. It also increases the activity of the dopamine synthesizing enzyme Tyrosine Hydrolase, thus ensuring continuous release.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.