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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

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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..

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Growth and Plant Hormones

Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

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Part of the genetic information is devoted to the synthesis of proteins. mRNA, a type of RNA, is produced as a transcri..

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Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..