If genes come in pairs, each parent will have two for each protein. Why don't the offspring have four genes for each protein?

during reproduction the male and female cells are split so they get 2 genes from the female and 2 genes from the male

Explanation:

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