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During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic

The first atomic explosion was detonated in the desert north of alamogordo, new mexico, on july 16, 1945. what percentage of the strontium-90 ( yr) originally produced by that explosion still remains as of july 16, 2016?

Explain the differences between convergent, divergent, and transform fault boundaries.