Answer:
That sucks i remember when i had to do it lol i hated it im srry you have to do it
Explanation:
I think it is c because primary research is original and from the certain time while secondary research is collected from others by research and stuff
Amino acids are the building blocks of proteins
Alveoli small balloon-like structures which are responsible for the oxygen exchange in the lungs across the membranes. These are attached to the branches of the bronchial passages. These alveoli inflate and deflate with inhalation and exhalation. Answer is C.
