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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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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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Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..

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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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Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..