2. Chapter 15 Invertebrates

3. An animal without a backbone Click for Term

4. Invertebrate An animal without a backbone Click for Term

5. A body plan in which two halves of an organism’s body are mirror images of each other Click for Term

6. Bilateral symmetry A body plan in which two halves of an organism’s body are mirror images of each other Click for Term

7. A body plan in which the parts of a body are arranged in a circle around a central point Click for Term

8. Radial symmetry A body plan in which the parts of a body are arranged in a circle around a central point Click for Term

9. Without symmetry Click for Term

10. Asymmetrical Without symmetry Click for Term

11. Group of nerve cells Click for Term

12. Ganglia Group of nerve cells Click for Term

13. The pouch where food is digested in animals Click for Term

14. Gut The pouch where food is digested in animals Click for Term

15. A cavity in the body of some animals where the gut and organs are located Click for Term

16. Coelom A cavity in the body of some animals where the gut and organs are located Click for Term

17. A circulatory system consisting of a heart that pumps blood through spaces called sinuses Click for Term

18. Open circulatory system A circulatory system consisting of a heart that pumps blood through spaces called sinuses Click for Term

19. A circulatory system in which a heart circulates blood through a network of vessels that forms a closed loop Click for Term

20. Closed circulatory system A circulatory system in which a heart circulates blood through a network of vessels that forms a closed loop Click for Term

21. One of many identical or almost identical repeating body parts Click for Term

22. Segment One of many identical or almost identical repeating body parts Click for Term

23. An external skeleton made of protein and chitin found in arthropods Click for Term

24. Exoskeleton An external skeleton made of protein and chitin found in arthropods Click for Term

25. An eye that is made of many identical units, or eyes, that work together Click for Term

26. Compound eye An eye that is made of many identical units, or eyes, that work together Click for Term

27. Feelers on an arthropod’s head that respond to touch or taste Click for Term

28. Antennae Feelers on an arthropod’s head that respond to touch or taste Click for Term

29. A jaw found on some arthropods Click for Term

30. Mandible A jaw found on some arthropods Click for Term

31. A process in which an insect or other animal changes form as it develops from an embryo or larva to an adult Click for Term

32. Metamorphosis A process in which an insect or other animal changes form as it develops from an embryo or larva to an adult Click for Term

33. An internal skeleton Click for Term

34. Endoskeleton An internal skeleton Click for Term

35. A system of water pumps and canals found in all echinoderms that allows them to move, eat, and breathe Click for Term

36. Water Vascular System A system of water pumps and canals found in all echinoderms that allows them to move, eat, and breathe Click for Term