Which two factors are critical to the existence of the carbon ...

[jman1234]

Which two factors are critical to the existence of the carbon dioxide (CO2 ) cycle on Earth?
 
  A) life and atmospheric oxygen
  B) life and active volcanism
  C) plate tectonics and liquid water oceans
  D) active volcanism and active tectonics

Question 2

A gamma-ray burster emits a quantity of energy similar to that emitted in a ________.
 
  Fill in the blank(s) with correct word

[Dinolord]

Answer to Question 1

C

Answer to Question 2

supernova or supernova explosion.