Geologic time scale showing highlights of Earth's history.(a)Dates appear in m.y.a.(millions of years ago). Which of the following is correct regarding the geologic time scale? A)The Jurassic period occurred during the Paleozoic era. B)Over 87 percent of Earth's history has elapsed during the more recent Cenozoic,Mesozoic,and Paleozoic eras. C)The bulk of Earth's history has occurred during the Precambrian eon. D)Modern humans live in the Tertiary period. E)Flowering plants emerged in the Precambrian.

Question

Quizplus · Accepted Answer

The geologic time scale is divided into eons, eras, and periods. The Precambrian eon, which includes the Hadean, Archean, and Proterozoic periods, accounts for about 88 percent of Earth's history.

Answer: D (incorrect)
 Modern humans do not live in the Tertiary period, which ended about 2.6 million years ago. We live in the Quaternary period, which began about 2.6 million years ago and includes the Pleistocene and Holocene epochs.

Answer: E (incorrect)
 Flowering plants (angiosperms) did not emerge until the Mesozoic era, specifically in the Early Cretaceous period, which began about 140 million years ago.

Answer: A (incorrect)
 The Jurassic period occurred during the Mesozoic era, not the Paleozoic. The Paleozoic era includes the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods.

Answer: B (incorrect)
 This statement is incorrect. Over 87 percent of Earth's history has elapsed during the Precambrian eon alone.

Geologic Time Scale Showing Highlights of Earth's History