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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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The Dinosaurs

Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

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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..

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A Balanced Vitamin Diet – Vitamins A – K

A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

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Control of Growth & Development

Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

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Gene Action – Operon Hypothesis

This tutorial focuses on the way genes control and determine every aspect of the body. It describes lac operon as an exa..