Author Question: All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ... (Read 250 times)

Yi-Chen · **on:** Jul 14, 2018

All of geologic time prior to the beginning of the Paleozoic era is commonly referred to as the ________.

A) Precambrian
B) Cambrian
C) Paleogene
D) Jurassic

Question 2

During alpha emission, the mass number is reduced by ________ and the atomic number is decreased by ________.

A) 2; 4
B) 4; 2
C) 3; 6
D) 6; 4