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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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This tutorial presents Gregor Mendel's law of dominance. Learn more about this form of inheritance and how it can be pre..

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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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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..