Q1 What are biodegradable and non biodegradable substances? Q2 Draw a diagram of Nitrogen cycle. Q3 What is pasteurisation? Q4 How do you prevent the spread of communicable diseases?
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Biodegrable substances are those substances which can be decomposed by microorganism
---vegetables
Non biodegradable substances are those which can not be degrade or decomposed by bioenzyme(microorganisms)--plastic
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