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Sludge in a separate tank is decomposed by anaerobic bacteria, producing:

ASteam
BBiogas
COzone
DOxygen
Answer & Solution
Correct answer: B. Biogas
1. Anaerobic bacteria work without oxygen. 2. They release biogas. 3. It fuels plants or makes electricity. _Source: syllabus Science, Chapter 18, Wastewater Story._
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