Waxy cuticle - to prevent water loss, Upper epidermis, Palisade Mesophyll - main photosynthesising layer, Spongy Mesophyll - contains air gaps for gas exchange, Lower epidermis, Stomata - structure to allow gas exchange, a leaf will have lots of these, Guard cells - opens and closes the stomata, CO2 - diffusing in, O2 diffusing out, Thin structure - this reduces diffusion distance and increases surface area

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