Is released by motor nerve endings onto muscle.
acetylcholine
norepinephrine
dopamine
serotonin

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.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.