Amino acids all contain nitrogen and these are the building blocks that make up the proteins in your hair, muscles, skin and other important tissues. Nitrogen is an important part of your DNA, which defines what you are like in many ways.
In facilitated diffusion molecules only move with the aid of a protein in the membrane. Normal diffusion requires molecules to move through a special doorway
I believe the answer is c
A is the answer. It’s like addition.
