Epidermis - protective layer of cells, Cuticle - waxy coating that prevents water loss, Stomata - pore-like openings on the underside of the leaf that allow gas exchange, Guard Cells - control the opening and closing of the stomata, Mesophyll - where photosynthesis takes place; made up of palisade layer and the spongy layer, Veins - contain xylem and phloem and transport water and nutrients, Xylem - transports water and minerals from the roots, Phloem - transports food from the leaves, Cambium - becomes growth rings in trees,

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