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Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..
This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..