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.
There are more than 7,000 different species of algae. Most live in the oceans, but they also live in fresh water and even on land. Also, algae produce about 330 billion tons of oxygen each year. Phytoplankton are tiny microscopic plants - algae - that form the base of the marine food chain. Phytoplankton is most abundant in colder waters where there is an abundance of nutrients. There are three types of algae: red, green and brown. Some algae in the ocean are very small and drift in the ocean water.