PT 15 S1 Q5

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Until the 1980s, most scientists believed that non-catastrophic geological ... ...

The author implies that if the theory described in the third paragraph is true, which one of the following would have been true of iridium in the atmosphere at the end of the Cretaceous period?
(A) Its level of concentration in the Earth's atmosphere would have been high due to a slow but steady increase in the atmospheric iridium that began in the early Cretaceous period.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: Science & Technology Mix 2

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