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Biological Energy
Biological Energy – ADP & ATP

ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

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Vascular Plants: Ferns and Relatives

Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

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Freshwater Communities & Lentic Waters

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

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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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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Theory of Natural Selection

This tutorial investigates the genetic diversity in more detail. It also delineates how certain alleles are favored over..