Chapter 8 - Animal Life Processes Vocabulary

2. when animals go through major body changes as they develop from young organisms to adults
4. the eggs of land vertebrates
6. nerve cells that carry response information to muscles and other organs
8. animals that live in water that strain their food from the water
12. the length of time between fertilization and birth
14. a nerve cell with a unique structure for receiving and passing on information
17. structures that an animal uses to exchange gases with its surroundings
19. animals that eat both plants and animals
20. tissues that contract or relax to create movement
24. fertilization that occurs inside the females body
25. the process in which cells use oxygen and digested food to release energy
29. an organized grouping of neurons in the head of an animal with bilateral symmetry
30. transports needed materials to cells and takes away wastes

1. animals that eat only other animals
3. nerve cells that detect stimuli
5. the process that breaks down food into small molecules
7. an animal's reaction to a stimulus
9. fertilization that occurs outside of the females body
10. allows animals to detect signals in their environments, processes the signals, and reacts to them
11. a place where two or more parts of a skeleton meet
13. a signal that causes an animal to react in some way
15. a system of fluid-filled tubes
16. an internal, gas-filled sac
18. when animals shed their exoskeletons periodically and produce new ones
21. nerve cells that pass information between neurons
22. a tissue that is more flexible than bone
23. an organ system that has specialized structures for obtaining and digesting food
26. animals that eat only plants
27. organ that allows materials to be exchanged between the embryo and the mother
28. when particles move from an area of high concentration to an area of low concentration