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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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Plant Biology

Plantlife can be studied at a variety of levels, from the molecular, genetic and biochemical level through organelles, c..

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This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

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A typical eukaryotic cell is comprised of cytoplasm with different organelles, such as nucleus, endoplasmic reticulum, G..

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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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Human Biology – Food and Digestion

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..