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

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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

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

Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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