3 AS Biology resources Search within results Go How ratings and recommendations work Apply Filter resourcesClear all filtersLevelClear filter AS SubjectClear filter Biology Exam board Other WJEC TopicClear filter Adaptations for gas exchange Resources Crossword Flashcards Mindmap Multi-tool Quizsearch Chapter 8 - Study Points AS, Biology Mindmap gas exchange AS, Biology Crossword Biology Definitions - Chapter 8 AS, Biology Crossword Search again