The correct answer is option d, that is, neurotransmitters.
A neurotransmitter refers to a chemical component, which is discharged at the terminal of a nerve fiber by the introduction of a nerve impulse, and by diffusing across the junction or synapse. It helps in the transfer of the impulse to another muscle fiber, nerve fiber, or some other composition. Acetylcholine is a kind of neurotransmitter, that is, used by neurons in the CNS and the PNS in the control of activities ranging from heart rate and muscle contraction to digestion and memory.
Answer:
c. by having designated uses for waterways , soil erosion can be completely avoided
The crust is not magnetic near the ocean ridges
The liver is at a #3 level of organization, an organ..which has a specific job to do in the body.
The important thing to identify the degrees of lightness to darkness in each level.
Hope this helps you.
