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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..
Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..