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

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Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

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Biological Cell Defense

Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..

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Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..