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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

Biological Energy
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ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

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