The Phanerozoic Eon corresponding to the age of complex multicellular life as recorded in fossils encompasses ___________.
A) only the first 50 million years of the Cambrian Period
B) the first 4.6 billion years of Earth history
C) only the latest 56 million years of Earth history
D) roughly the last 12% of Earth history

Question

Quizplus · Accepted Answer

The Phanerozoic Eon, which began about 541 million years ago, represents roughly the last 12% of Earth's history. This period is characterized by the emergence and evolution of complex multicellular life, significantly documented in the fossil record.

The Phanerozoic Eon Corresponding to the Age of Complex Multicellular