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ib biology ib biology hl ib biology sl ib plants hl biology hl bio ib inheritance photosynthesis ib biology 8.2 ib biology cell respiration ib membrane transport ib cells ib membrane structure ib classification ib cladistics cladistics ib cell theory how plants grow growth in plants transport in plants phloem transport xylem xylem natural selection evidence for evolution sl bio ib bio sexual reproduction anatomy and physiology osmoregulation kidney