Dinosaurs and many other species were extinct about ________ years ago.
Correct answer: B. 66 million
- A. 55 million
- B. 66 million
- C. 75 million
- D. 85 million
Explanation
The non-avian dinosaurs disappeared in the end-Cretaceous mass extinction about 66 million years ago. The event is commonly linked to the Chicxulub asteroid impact along with major environmental changes.
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About Environment and Atmosphere
Environmental science covers ecosystems, food chains and webs, energy flow, biogeochemical cycles, biodiversity, natural resources and population effects. Atmospheric study includes the layers and composition of air, weather and climate, greenhouse gases, global warming, ozone depletion, acid rain and pollution, with climate change distinguished from ordinary weather variation.
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