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Neural Control Mechanisms
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Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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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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This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

Homeostasis by water regulation
Homeostasis of Organism Water Regulation

Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..

Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..