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The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

Human Nervous System
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The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..

Birth Control and Contraception
Birth Control and Contraception

Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

Ecosystem Succession
Ecosystem Succession

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

Physiological Homeostasis
Physiological Homeostasis

Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..