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biology 0610printed 135 · PDF 135
328 pagesrevision 46933
printed 135 · PDF 135
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(c) State two other substances, apart from antibodies, transported by the blood.
(1)
(Total 5 marks)
(a) Explain how the skin and mucous membranes prevent entry of pathogens into the body.
@)
(b) Explain why antibiotics are used to treat bacterial but not viral diseases.
(2)
(Total 5 marks)
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