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 Large rooted plants, another type of producer, provide food and shelter for different organisms, fish and wildlife. 2  Primary Consumers The next level in the food chain is made up of primary consumers, or organisms that eat food produced by other organisms. 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.