A. true
b. false plankton and nekton are found in the ocean. a shark is an example of nekton.

The answer is A. True.

Plankton includes a diverse group of organisms that live in the water but are not capable of active swimming against the water current. On the contrary, nekton includes a diverse group of organisms that live in the water but are  capable of active swimming without the help of the water current. A shark is capable of active swimming, therefore, it is the example of nekton.

When you are making a guess you are forming a hypothesis