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This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

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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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Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

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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..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..