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.
When you factor in other species that feed on the same organism, then the chain becomes a web. Freshwater At the base of the freshwater food web are again the producers, such as phytoplankton, algae, duckweed, and lily pads.Just like on land, plants in water undergo photosynthesis and provide aquatic organisms with oxygen.hen you factor in other species that feed on the same organism, then the chain becomes a web. Freshwater At the base of the freshwater food web are again the producers, such as phytoplankton, algae, duckweed, and lily pads.