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Insects have microscopic air filled pipes called .........1......... which they use for gas exchange. Air moves into these through pores on the surface called ..........2............ oxygen travels down the concentration gradient towards the cells. The ......1........... branch off into smaller .........3............. which have thin permeable walls and go to individual cells. Insects use rhythmic ..........4............. movements to move air in and out of .........2.......
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