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.
Plankton are drifting organisms in aquatic environments, including marine and fresh water. They are the base of the food web in these environments. Plankton can be divided into broad functional groups: 1  Phytoplankton are microscopic plants that form the base of the marine food chain.2  Though they are small, the energy they capture from the sun through photosynthesis helps to sustain almost all life in the ocean.oplankton also need iron in their diet. So, that is also where zooplankton can be found; the top 100 meters of the water to be exact. Just like phytoplankton, zooplankton can't swim; instead they just float along with the currents, tides and and winds.