The side chain is the <span>portion of the amino acid that makes it unique.</span>
The answer B I hope this help you
Answer:
Location and structure of Merkrl's discs and Pacinian corpuscles.
Explanation:
Merkel's disc : this is located in the upper layers of the skin near the base of the epidermis. They are densely distributed in the fingertips and lips.
Pacinian corpuscles : they are nerve endings in the skin responsible for sensitivity to vibration and pressure. They are large and fewer in number. It is approximately oval shape and 1mm in length.
One way is that it add water to the atmosphere. Another way is that the trees and leafs provides the oxygen