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Question
What is a passive solar still?
Options:
A .  A solar still that uses photovoltaics to start
B .  A solar still that relies only on sun and wind
C .  A solar still that solely relies on sun to distill water
D .  A solar still that uses additional heat sources apart from sun
Answer: Option C
Answer: (c).A solar still that solely relies on sun to distill water

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