Class 8 Science MCQs – Certification Test 436

Micro-organisms and Viruses Quiz (Question 436) – App & e-Book Download

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MCQ 436: Systems which open to external environment are protected from bacteria by presence of:

mucus membranes
HCl
hairs
plug

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Class 8 Science Quiz App & e-Book – Micro-organisms and Viruses Exam Prep

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