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

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Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

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Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..

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Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

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Bryophytes

Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

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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..

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