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840s BC

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Centuries: 10th century BC - 9th century BC - 8th century BC

Decades: 890s BC 880s BC 870s BC 860s BC 850s BC - 840s BC - 830s BC 820s BC 810s BC 800s BC 790s BC

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Molecular evolution

... distinguish the species from its forebears. Because biologists and geneticists view every heritable change in trait or phenotype as necessarily a result of DNA changes, ...