Which of the following statements about the effect of the oxygen produced by the first photosynthetic autotrophs is false?
A.The oxygen they produced reacted with the iron in the oceans, forming iron oxide.
B.The oxygen they produced gave rise to the ozone layer.
C.The oxygen they produced reacted with the carbon monoxide in the atmosphere, forming carbon dixoide.
D.The oxygen they produced caused the first mass extinction on earth.

Question

Which of the following statements about the effect of the oxygen produced by the first photosynthetic autotrophs is false?
A.The oxygen they produced reacted with the iron in the oceans, forming iron oxide.
B.The oxygen they produced gave rise to the ozone layer.
C.The oxygen they produced reacted with the carbon monoxide in the atmosphere, forming carbon dixoide.
D.The oxygen they produced caused the first mass extinction on earth.

anonymous · Answer

Of all those, I think C is the false statement.

A: The first free oxygen reacted with the volcanic Fe
B: After a certain level of accumulation, the oxygen started forming the ozone layer
D: Many anoxic organisms perished as a consequence of the change of atmosphere