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Across 2. form of elastic collagen found in poriferans 4. tiny openings in the bark of a tree that allow air to enter the interior of the tree 7. first phlyum to have a circulatory system 9. insects get rid of wastes through these tubules 10. inner wall of the ovary 13. ring of petals 14. the developed version of the rendoderm in the cniariau 15. ocean bottom dwellers 16. free-living larval form of cnidarian 21. vascular plant 22. having both male and female flowers on the same plant 24. waxy layer within the endodermis that forces substances to pass through the plasma membranes of cells in the endodermis (2) 25. immature stage of an insect taht undergoes complete metamorphosis 28. having male and female flowers on separate plants 31. special cells in sponges that filter water 32. embryonic leaves 33. xylem cells (dead at maturity) that act as tiny"straws" for moving water (2) 35. embryonic development in which first pore formed becomes the anus 36. special cells that surround the xylem and phloem in a leaf and are involved in the storage of photosynthetic products, especially C4 plants 39. segments of a tapeworm 41. place water enters the water vascular system of a starfish. Also called the madreporite 44. living cells of the phloem that lose their nucleus and have perforated ends (3) 45. embryonic root 47. embryonic stem above cotyledon 49. hole in top of sponge that water flows out of 50. xylem cells with slanted ends and perforations 53. stinging cells found in cnidarians 54. opening in seed through which pollen tube passes. Allows water in for germination to begin 56. embryonic development in which first pore formed becomes the mouth 57. one of the four rings of flower parts 58. immature stage of an insect that undergoes incomplete metamorphosis

Down 1. first phylum to have a one-way digestive tract 3. phylum of roundworms 5. what CAM stands for 6. aggregation of sensory cells 7. phylum of ribbon worms 8. xylem cells with overlapping end walls and pits through which water passes. dead at maturity 11. form of asexual reproduction in sponges in which a piece breaks off and forms a new sponge 12. hollow structure that grows from pollen grain to ovule 17. fungi that form symbiotic relationship with plant roots to help them survive 18. ring of carpels (or pistils) 19. scorpions and horseshoe crabs belong in this classification 20. when plant parts begin to form into a new structurecalex: ring of sepals 23. phylum of flatworms 26. contain flickering cilia that propel water out of the cell (2) 27. female part of plant; some fuse to form sections like in an orange 29. the three walls of the ovary 30. ring of stamens 34. survivor pods 37. point of seed attachment to pod 38. special cells in sponges that transport food from cell to cell 40. forms the pollen tube (2) 41. structural skeleton of a sponge 42. embryonic stem:root below cotyledon 43. bristles earthworms use to grip ground 46. triploid food for a plant embryo 48. first phylum to have a pseudocoelom 51. toothlike grinding organ in mollusk 52. sensory structionres that have calcium in them 55. general layer of cells between the root epidermis and the vascular cylinder