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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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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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

Origins of Life on Earth
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..

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There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..