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To generate ATP, some anaerobic protozoans use the following ______.
A. hydrogenosomes only
B. mitochondria only
C. a denitrifying bacterium only
D. hydrogenosomes or mitochondria
E. hydrogenosomes or a denitrifying bacterium
F. mitochondria or a denitrifying bacterium
G. hydrogenosomes, denitrifying bacterium or mitochondria