Microbial fuel cells are considered a source of substainable energy. why?1. They use living organisms as catalysts to generate electricity from certain susbtracts. 2. They use a variety of inorganic materials as susbtrates.3. They can be installed in waste water treatment plants to cleanse water and produce electrucity.which statements given above is / are correct?

Microbial fuel cells are considered a source of substainable energy. w

1.	Microbial fuel cells are considered a source of substainable energy. why? 1. They use living organisms as catalysts to generate electricity from certain susbtracts. 2. They use a variety of inorganic materials as susbtrates. 3. They can be installed in waste water treatment plants to cleanse water and produce electrucity. which statements given above is / are correct?
A.	1 only
B.	2 and 3 only
C.	1 and 3 only
D.	1, 2 and 3
Answer» C. 1 and 3 only