All of geologic time prior to the beginning of the Paleozoic era ...

[Yi-Chen]

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

[l.stuut]

Answer to Question 1

Answer: A

Answer to Question 2

Answer: B

[Yi-Chen]

Thanks for the timely response, appreciate it

[deja]

Gracias!