Why didn't oxygen begin to accumulate in the atmosphere until ...

[tfester]

Why didn't oxygen begin to accumulate in the atmosphere until approximately 1.5 billion years after life appeared on Earth?
 
  A) Early forms of animal life consumed the oxygen.
  B) Early forms of plant life consumed oxygen.
  C) All the oxygen produced by life went into making the ozone layer.
  D) Oxygen produced by life was removed from the atmosphere by oxidation reactions with surface rocks.
  E) Oxygen produced by life was removed from the atmosphere by dissolving in the ocean.

Question 2

The names of the seven days of the week are derived from the names of the bodies of the solar system that are visible to the naked eye.
 
  Indicate whether the statement is true or false

[jesse.fleming]

Answer to Question 1

D

Answer to Question 2

TRUE

[tfester]

Thanks

[jesse.fleming]

Welcome