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Class 7 Science MCQs – Certification Test 1073

Acids and Alkalis Trivia (Question 1073) – Learning App & e-Book Download

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MCQ 1073: Tooth decay occurs in our mouth due to presence of:

  1. bacteria
  2. virus
  3. fungus
  4. algae
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Acids and Alkalis Trivia App & e-Book – Class 7 Science Exam Prep

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