Bilateral Symmetry - able to superimpose one half other the other, Mesoderm - The middle layer between the ectoderm and endoderm, Flatworms - Worms that have no space between their three layers, Annelida - A phylum for segmented worms, Earthworm - A famous segmented worm, Setae - Hairs that anchor the worm, Anterior - Near the Head and sense organs, Posterior - Near the opposite side of the head, Dorsal - Orientation term for the back(Human), Ventral - Orientation term for the stomach(Human), Pharynx - Tube which is the mouth for the planaria, Ganglia - Brain of the planaria, Parasite - Organism which needs a host to survive, Regeneration - Able to reproduce a whole organism from a part, Flame cell - A cell with cilia to move materials through, Aortic Arches - Heart of a earthworm, Nephridia - Help eliminate waste for the earthworm,

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