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Leaves are the major photosynthetic organ of a plant. Apart from that, they are also crucial to water movement. In this ..

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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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

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It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..

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Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

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

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