Approximately how many years ago did the Precambrian era begin? O A. 5 million
B. 50 billion
C. 5 billion
O D. 50 million

PRECAMBRIAN TIME COVERS the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms almost four billion years later.

answer; i believe the answer is hydraulic action;