Reproduction
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
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Reproduction is the property by which organisms produce offspring, passing on genetic material that shapes the next generation.
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A single-celled organism reproduces by duplicating its DNA and dividing into two; a multicellular organism instead produces specialized reproductive cells.
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Reproduction explains how traits pass on, not why any single trait exists in the first place.