What are the three classifications of marine organisms?

A:intertidal, neritic, and benthic

B:plankton, nekton, and benthos

C:bioluminescent, hydrothermal, and intertidal

D:surface, transition, and deep ocean

The correct option is B.

Marine organisms are divided into three groups, which are: plankton, nekton and benthos. Planktons refers to those marine organisms that float, nektons refers to those that actively swim while benthos refers to those that live on or in the ocean bottom.