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This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

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Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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

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

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..