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Key Concepts

CephalopodsThe following are key concepts that you should be familiar with after reading and studying Chapter 19: Earth History: A Brief Summary. To evaluate your understanding of any of the key concepts, select the corresponding Concept Quiz from the Selection Bar and answer the questions provided.


  1. The origin of Earth and the evolution of its atmosphere.

  2. The vast Precambrian time.

  3. The Paleozoic Era: life "explodes."

  4. The Mesozoic Era: age of the dinosaurs.

  5. The Cenozoic Era: age of mammals.






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