Pls HELP ASAP 9th grade work

A

Explanation:

The substrate is the substance that enzymes act on. If you were confused as to why it's not B, B is the product that appears after the enzyme breaks down the substrate.

not sure if this what   you'r looking for would be percent composition

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above