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This study guide tackles plant roots in greater detail. It delves into the development of plant roots, the root structur..

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Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..

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