D Question 4 Which mass extinction led to the disappearance of the dinosaurs? O Triassic O Cretaceous-Tertiary (K-T) O Devonian O Permian D Question 6 During what geological period did modern humans emerge? O urassic O Ordovician O Quaternary O Neogene Question 1 You are performing radiometric dating using radioactive isotope A, which has a half life of 100,000 years. If there are 20,000 atoms of isotope A to begin with (and zero atoms of the stable isotope B that results from isotope A's radioactive decay), how long will it take for there to be 2,500 atoms of radioactive isotope A left? O 200.000 O 50.000 O 300,000 O 100,000

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