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This Concept Map, created with IHMC CmapTools, has information related to: hair, animals is different because medullary index, structure such as shaft, overlapping scales called spinous, roots produces shaft, humans types such as stacked, medulla present in animals, roots have 3 known cross-sections oval, Hair has function, structure such as tip, function such as bacteria protection, humans types such as continuous, outside called cuticle, function such as UV protection, Hair has layers on inside, follicle produces roots, Hair has layers on core, humans types such as intermittent, roots have 3 known cross-sections circle, inside called cortex, cuticle comprised of overlapping scales