education chart of biology for cross section of leaf diagram

anatomy biology botany cell cells chart chlorophyll chloroplast close cross crosssection cuticle cytoplasm diagram education endoplasmic energy epidermis golgi illustration isolated layers leaf learning membrane mesophyll microscope mitochondria nature nucleus open palisade phloem photosynthesis plant quard respiration reticulum ribosome science section spongy stoma stomata structure thylakoid tissue vein wall water xylem