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This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..

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Population Regulation in an Ecosystem

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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Lights’ Effect on Growth

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

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This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

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In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..