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Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

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Bryophytes (nonvascular plants) are a plant group characterized by lacking vascular tissues. They include the mosses, th..

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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 describes the different types and causes of brain damage. Find out how genetics, physical injury, lack of ..

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