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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..

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Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

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Examples of Natural Selection

Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..