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Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..

Ecosystem Succession
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If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

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

Digestion and Absorption of Food
Digestion and Absorption of Food

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