Invertebrate Vocab

2. Natural process of replacing or restoring damaged parts
4. Part of the body containing the pancreas, stomach, intestines, liver, and other organs
7. neuronal bodies in the peripheral nervous system
8. Animals with flexible rods that support their backs
9. A hollow tube inside the neck
11. The area of the body that's between the neck and abdomen
12. Animals that lack backbones
14. Small external opening of a trachea
16. A segment of a tapeworm
17. A perforated body that's in the stone canal
18. Supports and protects soft tissue in animals
19. Sac-like enlargment of a canal
21. A embryonic midline structure
23. Largest and strongest bone in the face
24. Fertilized egg cell

1. Small Stucture of a sea urchin
3. Tiny tubes of most echinoderms
5. The head of a tapeworm
6. A hollow cell that has a tuft of vibratile cilia
10. Chemical signals
13. A development process that transforms one-dimensional layers into multiple layers
15. Supporting Framework in Animals
20. Shedding of the exoskeleton
22. Animals with backbones