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Which term difines a well tested scientifically supported statement that explains how something works

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Which term difines a well tested scientifically supported statement that explains how something work...

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Biology, 17.10.2019 22:30

Which is a correct order from older to younger for layering of rocks shown in the figure. b, i,d, h,cf, e,d, c,bb, c,d, e,f h,...