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This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

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

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

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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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Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..