Answer:
acetylcholine
Explanation:
Acetylcholine stimulates contraction in some smooth muscle and relaxation in other smooth muscle types through the release of nitric oxide.
B. longitudinal I believe
Answer:
decomposers
Explanation:
These are heterotrophic organisms that feed on dead animals and plants, secretions, or discarded parts of living beings, that is, organic matter.
And they break it down into inorganic.
Thus, inorganic substances that can be reused in the process of photosynthesis are returned, recycled, to nature.