Answer:
The enzyme’s active site binds to the substrate. Since enzymes are proteins, this site is composed of a unique combination of amino acid residues (side chains or R groups). Each amino acid residue can be large or small; weakly acidic or basic; hydrophilic or hydrophobic; and positively-charged.
Explanation:
I did not understand the question and I do not think this a finished question.
A. Lungs because thats your respiratory system
Check, Call, and Care. I hope this helped :)
