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B
Roundworm
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C
Flatworm
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D
None of the above
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Solution
The correct option is C Earthworms
Vermi-processing toilets is a design of a toilet in which humans excreta is treated by earthworms and redworms.
In this process, human excreta is completely converted to cake-like structures called vermi cakes by earthworms. Vermi cakes are used as manure and fertilizers.