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Biology Topic Wise question with answer

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Question #88,478
Biology Topic Wise हिन्दी MCQ SSC GD 18/02/2019 (Shift-III)

Q.यदि दूध को ग्रीष्मकाल में फ्रिज के बाहर रखा जाए तो वह खट्टा हो जाता है जिसका कारण है: