Exam (elaborations)
OCR 2023 GCSE Combined Science B Twenty First Century Science J260/04: Combined science (Foundation Tier) Question Paper & Mark Scheme (Merged)
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2 © OCR 2023 Stomach acid Clots the blood to prevent pathogens from entering cuts Skin Produces antibodies, or ingests and digests pathogens Platelet Barrier that prevents pathogens from entering the body White blood cell Can kill pathogens and stop them from reproducing 1 Pathogens ...
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