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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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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..

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Population Growth and Survivorship

This lesson looks at population attributes, regulation, and growth. It also covers population genetics, particularly gen..

Adaptation Tutorial
Adaptation Tutorial

Adaptation, in biology and ecology, refers to the process or trait through which organisms or the populations in a habit..

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Biological Viruses

Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

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