Interspecific competition I believe
Answer: buccinator
Explanation:
The buccinator is a muscle that looks quadrilateral in shape. It is present between the internal of mandible and maxilla. It basically forms the anterior portion of the cheek and also forms the part of the oral cavity. The buccinator muscles compresses the cheeks against the teeth. These muscles are used to perform the acts like blowing. The buccinator muscles are the assistant muscles which helps in the process of mastication or chewing and in case of neonates it is used to suckle.
Rounded, Rod-like & Spiral
I think it is keystone. If they were not there the population of urchins would go up and the kelp would go down.
It could have the most direct effect on the amount of mitochondria in cells and also the system of the membrane.
