1. Time scale of the earth. Which is the correctorder?
a. Azoic era, Proterozoic era, Paleozoic era, Mesozoic era,Cenozoic era.
b. Proterozoic era, Paleozoic era, Mesozoic era, Azoic era,Cenozoic era
c. Azoic era, Cenozoic era, Proterozoic era, Paleozoic era,Mesozoic era
D. Paleozoic era, Mesozoic era, Azoic era, Cenozoic era,Proterozoic era
2. At the end of the Mesozoic Era (ca. 65.5 million yearsago), there was a major catastrophic extinction of life on earth.Which of the following statements is true of this extinctionperiod?
A. It was the only major extinction period on ourplanet.
B. It was the greatest extinction period.
C. It resulted in the death of all species of plants andanimals.
D. None of the above.
