A millibar is a unit of pressure which is most commonly seen in the context of meteorology, where atmospheric pressure is sometimes given in millibars. As the name would suggest, a millibar is equal to one thousandth of a bar.
User: The microscopic organisms at the base of the marine food chain are known as A. plant life. B. terrestrial animals. C. primitive life. D. phytoplankton. Weegy: The microscopic organisms at the base of the marine food chain are known as Phytoplankton. User: In addition to being necessary for respiration, _______ also provides UV radiation protection. A. water B. hydrogen C. oxygen D. carbon dioxide.
Many zooplankters are herbivores on the phytoplankton (diatoms and dinoflagellates). Almost every marine animal phylum has a larval stage that can be found in the plankton (sponges, sea anemones, worms, snails, crabs, lobsters, sea stars).iatoms are important oxygen producers in marine ecosystems (usually the first step in the food chain). They are holoplanktonic. When conditions are bad they die, sink, the cell decomposes and the frustule breaks up and mixes with sand and mud.