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A vermi-processing toilet treats human excreta using:

ASunlight
BEarthworms
CChlorine
DBacteria
Answer & Solution
Correct answer: B. Earthworms
1. It uses little water and is hygienic. 2. Earthworms convert excreta to vermi cakes. 3. The cakes enrich soil. _Source: syllabus Science, Chapter 18, Wastewater Story._
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