What monomer is needed to speed up chemical
reactions?

Enzymes

Explanation:

Proteins are polymers made up of ammo acids. Enzymes are a category of proteins. They are catalysts. They speed up the rate of a chemical reaction.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.