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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..

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

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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Water Cycle
The Water Cycle

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

Neural Control Mechanisms
Neural Control Mechanisms

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

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