Are the building blocks of protein.

Amino acids are the main building block of protein There are 20 of the amino acids and they are used to form large protein molecules. I hope this helps!

Amino acids are the building blocks of protein

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.