Answer:
acetylcholine
Explanation:
Acetylcholine stimulates contraction in some smooth muscle and relaxation in other smooth muscle types through the release of nitric oxide.
Answer:
C. Both continuous variation and discontinuous variation
Explanation:
<em>this was the answer on my quiz a couple days ago</em>
Just saying it says 8 points ya little baka
A swim bladder can inflate and deflate when the swim bladder inflates it moves on the surface of the water but if it deflates it will go to the under section of the water <span />
