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

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The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

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

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Ecological Research: Measuring & Analysis

This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

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Freshwater Communities & Lentic Waters

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