Microbial fuel cells are considered a source of sustainable energy. Wh

1.	Microbial fuel cells are considered a source of sustainable energy. Why ?
A.	1 only
B.	2 and 3 only
C.	1 and 3 only
D.	1, 2 and 3
Answer» D. 1, 2 and 3

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Microbial fuel cells are considered a source of sustainable energy. Why ?

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