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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

Early Earth
The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

Birth of a Human Baby
Birth of a Human Baby

Following nine months inside the mother's womb is the birth of the baby. Know the different stages of the birthing proce..

Consciousness and behavior
Consciousness and Behavior

Human consciousness and behavior are an interesting topic since they are determined and controlled by the brain. Conscio..