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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..

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This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

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Chromosomes X and Y and Sex Determination

This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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

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Effect of Chemicals on Growth & Development in Organisms

Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..