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.
1 Phytoplankton: photosynthetic plankton that are usually microscopic and are also called âalgae... 2  more. 3  Zooplankton: small, sometimes microscopic animals that live in water and feed on phytoplankton (algae), other zooplankton, or detritus (dead material)...4  more.here are bacteria that decompose, or break down, dead organisms and animal waste in the water. There are also photosynthetic bacteria that use the sunâs energy to turn carbon dioxide into sugars. These are called cyanobacteria, and theyâre a type of phytoplankton. Other kinds of phytoplankton, though, are eukaryotes.