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Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..

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Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

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A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

Circulation
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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

Evolution of Life - Ancient Earth
Evolution of Life – Ancient Earth

Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

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Growth and Development of a Human Baby

Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..