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Q)

For how many years have the dinosaurs been extinct?

$\begin{array}{1 1} \text{a)About 25 million years} \\ \text{ b)About 65 million years} \\ \text{ c)About 100 million years} \\ \text{ d)About 135 million years} \end{array}$

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A)
Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. The dinosaurs' long period of dominance certainly makes them unqualified successes in the history of life on Earth.
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