Abenefit of being multicellular includes all of the following except:
a. an organism can become larger
b. cells can specialize for greater efficiency
c. cells can specialize for development of new functions
d. some cells have to give up reproduction

d. Some cells have to give up reproduction.

Explanation:

Multicellular organisms are the organisms that exhibit numerous cells each having a specialized function. These cells undergo cell division and differentiation so as to increase in numbers. The pre-existing cells give birth to the new cells.

Therefore, some cells have to give up repeoduction is the correct option.

they are known to reach a speed of 21 miles per hour

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