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2. A review worksheet on harmful/helpful micro-organisms and biodegradable/non-biodegradable items by BBC-Teachers [http://downloads.bbc.co.uk/schools/teachers/ks2worksheets/bbc_teachers_ks2_science_worksheet_microorganisms.pdf 'Microorganisms']
 
2. A review worksheet on harmful/helpful micro-organisms and biodegradable/non-biodegradable items by BBC-Teachers [http://downloads.bbc.co.uk/schools/teachers/ks2worksheets/bbc_teachers_ks2_science_worksheet_microorganisms.pdf 'Microorganisms']
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3. How do vaccines provide immunity? How is the immune response initiated by vaccines similar to the body's natural immune response? These questions could be explored through this video.
    
==Reference Books==
 
==Reference Books==

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