I think it is keystone. If they were not there the population of urchins would go up and the kelp would go down.
Isotonic solution
This is a solution in which there is no net movement of water into our out of the cell when a cell is placed in this solution. The solution is also dilute.
<span>The nervous system that controls the voluntary functon of the limbs and the sense organs is called the Autonomic nervous system. The Autonomic nervous system is make up of both, the Parasympathetic nervous system and the Sympathetic nervous system.</span>
Answer:
1st, 3rd, 5th
Um the brainliest answer would be appreciated greatly :)
