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Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..

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Birth Control and Contraception

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

Geological Periods
Geological Periods

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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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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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..