Which of the following is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle?
a) norepinephrine
b) gamma aminobutyric acid
c) acetylcholine
d) cholinesterase
c) acetylcholine

C) acetylcholine

Explanation:

Acetylcholine is an excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle.

However, norepinephrine, gamma aminobutyric acid, and cholinesterase are not excitatory neurotransmitter secreted by motor neurons innervating skeletal muscle.

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )