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This Concept Map, created with IHMC CmapTools, has information related to: Leaf Structure 2-18, external leaf structure consists of petiole, lamina has a thin,large flat surface, stomata function Regulate gaseous exchange and water loss from leaves, internal leaf structure has upper epidermis, lower epidermis is one cell thick, internal leaf structure has lower epidermis, lower epidermis protect inner region of leaf, waxy cuticle Functions: Protects leaf, waxy cuticle Functions: Prevents excess evaporation of water, thin,large flat surface to receive sunlight, palisade layer Functions: Rapid diffusion of O2 and CO2, spongy layer contain fewer chloroplasts, thin,large flat surface to receive air, upper epidermis has fewer stomata, internal leaf structure has spongy layer, leaf structure broken down into internal leaf structure, spongy layer structure large intercellular spaces, external leaf structure consists of lamina, palisade layer Functions: Thin wall for light penetration, upper epidermis is one cell thick