A) Infolding of the flexible cell membrane.
B) Loss of the cell wall.
C) A switch from aerobic to anaerobic metabolism.
D) Endosymbiosis of once free-living prokaryotes.
Correct Answer: C
Solution :
The environment was becoming oxygen- rich. There was not a switch from aerobic to anaerobic metabolism but vice versa.You need to login to perform this action.
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