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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

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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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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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Psychiatry & Mental Disorders

Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..

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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..