Photic Zone

Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..

A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

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

This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..

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