3 GCSE Biology resources Search within results Go How ratings and recommendations work Apply Filter resourcesClear all filtersLevelClear filter GCSE SubjectClear filter Biology Exam board All boards TopicClear filter gas exchange Resources Crossword Flashcards Multi-tool Quizsearch Revision Notes gas exchange GCSE, Biology 16 flashcards biologie GCSE, Biology Crossword Structures of Gas exchange GCSE, Biology Revision notes Search again