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Across 2. hollow ball of zygote 5. predators stressed adaptive radiations 8. having 2 pairs of antenna 10. have feathery gill 11. called sea squirts 14. having both eggs & sperm 16. produced all major body plans 18. having 2 pairs of legs per segment 19. mesoderms made array of variations 20. echinoderm that lacks hard exoskeleton 21. 5% of animals 23. has a "foot" 24. symmetrical everywhere 26. used to take in food, water and sperm in sponge 28. class of octopus & squid 30. go by pill bugs 31. flatworm that has 2 hosts 33. have book lungs 35. flatworm w/ flame cells for excretion 37. class of slugs & snails 38. has no nerves or muscles 39. having 1 pair of legs per segment

Down 1. small & complete digestive tract 2. 1 line of symmetry 3. are spinless & fishlike animals 4. blastula developing mouth and anus 6. having 3 pairs of walking legs 7. used in excretion for earthworms 9. class of clams & oysters 12. have 7000 species 13. 95% of animals 15. echinoderma w/ no suckers on tube feet 17. have trache 22. flatworm w/ hooks or suckers 25. diverged from flatworms 27. diverged from echinoderms 29. most successful group of animals 32. a jellyfish 34. fertilized egg 36. sea anemone