Kelp is a kind of: brown algae fungi plant red algae

Kelp is a kind of a brown algae (Phaeophyceae). It is a cold-water seaweed also used as food and as a source of iodine. It is considered safer and better than any other chemicals for the body. It develops through sunlight and it gets nutrients and minerals from the water around it.

This is the most closely resembles the model. 

Both prokaryotic and eukaryotic cells have ribosomes and cell membranes