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

Chromosomes X and Y and Sex Determination
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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

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

Geological Periods
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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..