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.
At the base of the aquatic food web are: 1  Plankton Plankton are microscopic plants and animals whose movements are largely dependent upon currents. 2  Phytoplankton Plant plankton are called phytoplankton and may be single cells or colonies. 3  Zooplankton Animal plankton are called zooplankton. In the Great Lakes, most producers are phytoplankton, or microscopic floating plants. 2  An example of phytoplankton is green algae. 3  Large rooted plants, another type of producer, provide food and shelter for different organisms, fish and wildlife.