Across
- 6. animals that eat both plants and animals
- 7. tissue that is more flexible that bone
- 9. nerve cells that carry response information to muscles and other organs
- 11. a signal that causes an animal to react
- 12. how information travels in a nerve cell
- 13. animals that only plants
- 15. an organized grouping of neurons with bilateral symmetry
- 16. nerve cell with unique structure receiving and passing on information
- 18. is an internal gas filled sac
Down
- 1. nerve cells that detect stimuli
- 2. animals that strain their food from water
- 3. a system of fluid-filled tubes
- 4. where two or more parts of a skeleton meet
- 5. process that breaks down food into small molecules
- 7. animals that only eat other animals
- 8. nerve cells that pass information between neurons
- 9. when arthropods must shed their exoskeletons and produce new ones
- 10. an animals reaction to a stimulus
- 14. receives information from the environment and coordinates a response
- 17. tissue that contract or relax to create movement