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SPONGES HYDRA PLANARIAN EARTHWORM SNAIL STARFISH GRASSHOPPER CRAYFISH FROG HUMAN 26 26 27 27 27 28 28 28 30 35-40 PICTURE PHYLUM BODY SYMMETRY DIGESTIVE SYSTEM CIRCULATORY SYSTEM RESPIRATORY SYSTEM EXCRETORY SYSTEM NERVOUS SYSTEM FERTILIZATION SKELETAL SYSTEM CHAPTER