With the advent of technology, researchers have been able to focus their attention on the messengers of the brain, neurotransmitters. researchers can introduce to alter the activity level of a neurotransmitter in order to analyze the effects of introducing a substance that decreases the activity of a neurotransmitter.

With the advent of technology, researchers have been able to focus their attention on the messengers of the brain, neurotransmitters. Researchers can introduce agonists to alter the activity level of a neurotransmitter in order to analyze the effects of introducing a substance that decreases the activity of a neurotransmitter.

a- all cells come from pre-existing cells

i think that you are smart and you should fit for it out