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OCR 2023 GCSE Combined Science B Twenty First Century Science J260/01: Biology (Foundation Tier) Question Paper & Mark Scheme (Merged)
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2 © OCR 2023 Chemical Bacteria in the gut compete against pathogens Microbial Skin stops pathogens entering the body Physical Stomach acid destroys pathogens 1 Some bacteria are pathogens that cause diseases. (a) Our blood contains white blood cells. They help protect us against pathogens...
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