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

Types and Causes of Brain Damage
Types and Causes of Brain Damage

This tutorial describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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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..

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Human Reproduction and Fertilization

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