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4 2 15 Sponges don t have muscles and nerves Animals have blastula and gastrulation stage also larval Know symmetries and protostomes and animal groups Collar cells ameoboe cells knito cites Know all 9 Cephalization Digested system with one opening if present Nematodes Bilateral symm Cephalzation Complete digestive system Only annelids segmented Trilobites are extinct marine anthropods Appendiges on ventral side
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