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

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

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A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

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Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..