The main function of the cell membrane is to control what enters and exits the cell.

One of its jobs is to control what enters and exits the cell and thereby to protect the cell. ... Sometimes carbohydrates (sugars) are attached to cell membrane phospholipids and to cell membrane proteins. A selectively permeable (sometimes called semi-permeable) membrane allows some molecules across but not others.

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the correct option is option d

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