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Microbial fuel cells are considered a source of sustainable energy. Why? 1. They use living organisms as catalysts to generate electricity from certain substrates.
2. They use a variety of inorganic materials as substrates.
3. They can be installed in wastewater treatment plants to cleanse water and produce electricity.

(a)

1 only

(b)

2 and 3 only

(c)

1 and 3 only

(d)

1, 2 and 3

Correct Answer

(c)

Explanation

Microbial fuel cells use living organisms to generate electricity from organic substrates and can be used in wastewater treatment plants. They do not primarily use inorganic materials.