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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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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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This tutorial elucidates body temperature regulation. Know the details here to learn how the body sets the body temperat..

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Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..