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

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Proteins and minerals can be derived from various dietary sources. They are essential for the proper growth and developm..

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Pollution in Freshwater Ecosystems

There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..

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The Origins of Life

This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..