Rock Layer E is 250,000 years old. Rock Layer C is 200,000 years old. Rock layer C has not undergone radioactive decay and has 18 radioactive isotopes. The half-life is 50,000 years. Rock Layer E has undergone radioactive decay ONCE, how many daughter and parent isotopes are present in layer E?
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The most common economic system in the world is aclosed economy.command economy.mixed market economy.traditional economy.
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Rock Layer E is 250,000 years old. Rock Layer C is 200,000 years old. Rock layer C has not undergone...
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