Animal Kingdom

1: (a) Porifera, 2: (d) Both b and c, 3: (c) Organ level, 4: (b) Annelida, 5: (a) Hydra, 6: (b) Echinodermata, 7: (c) Three, 8: (b) Platyhelminthes, 9: (a) Aschelminthes, 10: (d) Annelida