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This tutorial elaborates on the physical development of humans, particularly from puberty to adulthood. Read this tutori..

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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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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..

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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..