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Anatomy of a Leaf
This thorough site provides a wealth of leaf information which includes, leaf functions, origin of the leaf, meristem structure, and anatomy of a leaf (contains a drawing of a typical leaf cross section).
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Biology 101: Leaves: Structure Promotes Function
Discusses leaf anatomy and relates this discussion to the photosynthesis function of the leaf.
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Stuttgard High School: Plant Structure & Function
Site features high school-level comprehensive info on the structure and function of seed plants organized into shoot and root systems. While presented with lots of detail, clear illustrations and animations help make sense of the parts...