Answer:
acetylcholine
Explanation:
Acetylcholine stimulates contraction in some smooth muscle and relaxation in other smooth muscle types through the release of nitric oxide.
Answer:
The ocean produces oxygen through the plants (phytoplankton, kelp, and algal plankton) that live in it. These plants produce oxygen as a byproduct of photosynthesis, a process which converts carbon dioxide and sunlight into sugars the organism can use for energy.
Explanation:
hope it helps
Protist just can do one function only.the just have
