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.
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.hey 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.