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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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The Hominids

The hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has prov..

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Sigmund Freud and Carl Gustav Jung

In this tutorial, the works of Carl Gustav Jung and Sigmund Freud are described. Both of them actively pursued the way h..

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Fruits, Flowers, and Seeds

This tutorial deals with the structure and function of flowers, fruits, and seeds. Also included here are the types of f..

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Neural Control Mechanisms

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Soils

Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..