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

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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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Muscle

Muscle cells are specialized to generate force and movement. Learn about the different types of muscle tissues in this t..