are the autotrophic components of the plankton community and a key part of oceans; refers to the aggregate of actively swimming aquatic organisms in a body of water: is the community of organisms that live on, in, or near the seabed: are the diverse collection of organisms that live in large bodies of water and are unable to swim against a current; consists of the water column of the open ocean; and consisting of small animals and the immature stages of larger animals, so they are heterotrophic..