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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..

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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..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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Freshwater Producers and Consumers

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

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Plant Water Regulation

Plants need to regulate water in order to stay upright and structurally stable. Find out the different evolutionary adap..

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Abiotic and Biotic Factors

This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..