colloid. 1  a solid, liquid, or gaseous substance made up of very small, insoluble particles (as single large molecules or masses of smaller molecules) that remain in suspension in a surrounding solid, liquid, or gaseous medium of different matter.
Nekton. Nekton are the animals that can move by themselves in the ocean waters. Nekton live in all zones of the ocean. However, just like benthos and plankton, most live in the sunlight zone or shallow twilight zone since there is the most sunlight and it is easy to feed on smaller organisms such as krill and minnows.
Making the world better, one answer at a time. The Limnetic zone should have the most plankton, as it is the section with the best suitable conditions for organisms to thrive. The Limnetic zone is wide opened to sunlight, and is also oxygen filled. However the profundal zone has a very limmited supply of oxygen and sunlight, which makes the water cold and harder for organisms, such as plankton to thrive there.