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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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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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Control of Body Movement

Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

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

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