1Biologists studying the evolution of life on Earth regard the existence of geological deposits of iron oxide as particularly significant. These deposits of iron oxide are seen as evidence for:
(A) The change from an anoxic to an oxic atmosphere
(B) The existence of procaryotes which metabolise iron
(C) The role of meteorites in bringing life to Earth
(D) The role of iron as a catalyst in the formation of the chemicals of early life.

Question

1Biologists studying the evolution of life on Earth regard the existence of geological deposits of iron oxide as particularly significant. These deposits of iron oxide are seen as evidence for:
(A)	The change from an anoxic to an oxic atmosphere
(B)	The existence of procaryotes which metabolise iron
(C)	The role of meteorites in bringing life to Earth
(D)	The role of iron as a catalyst in the formation of the chemicals of early life.

anonymous · Answer

a brief read on cyanobacteria and stromatolite will help you posit the right answer