I think it is keystone. If they were not there the population of urchins would go up and the kelp would go down.
Answer:
Dermis.
Explanation:
The skin is the outer most protective layer that differ in structure and composition of the vertebrates. The main function of skin is the regualtion, sensation and protection of the organism.
The skin is divided into different layer : epidermis, basement membrane dermis, and subcutaneous tissue. Only the dermis layer contains the living cells that are highly vascularized and present beneath the hypodermis. Dermis layer protect the body from the stress and strain.
Thus, the correct answer is option (2).
It seems That teh molecules can move towards the membrane
Mouth, throat, stomach, long intestine, small intestine, then you know what happens after that...
