PLEASE HELP ASAP! How do mitosis and cell differentiation work together to produce and maintain a complex organism?

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

the missing space is phylum