Where is the protective covering of the axon?

Myelin. a fatty substance that forms a protective coating around the axon of a neuron

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