Across
- 3. An invertebrate animal that includes jellyfish, corals and hydras
- 6. The process by which an arthropod sheds its external skin
- 7. An arrangement of body parts that resembles the arrangement of spokes on a wheel
- 9. A simple worm that is flat and thin
- 14. Changes in form during development in which earlier stages look like the adult
- 15. A small structure used by echinoderms for movement
- 17. A member of the largest group of invertebrates, which includes insects
Down
- 1. Changes in form during development in which earlier stages do not look like the adult
- 2. An armlike body part in invertebrates that is used for capturing prey
- 4. An animal that does not have a backbone
- 5. A body plan that consists of left and right halves that are the same
- 8. An invertebrate divided into three parts
- 10. A class of arthropods that includes spiders, scorpions, mites and tics
- 11. A class of arthropods that includes crabs, lobsters, crayfish and sow bugs
- 12. worm A worm whose body is divided into sections, such as earthworms or leeches
- 13. A worm with a smooth, round body and pointed ends
- 16. A stage in the development of some insects that leads to the adult stage