Across
- 3. an animal that develops from two separate embryonic germ layers
- 4. The internal body cavity seen in arthropods
- 6. a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection
- 8. made classification
- 9. a series of separate bones that surround the spinal cords in vertebrates
- 12. a phylum of deuterostomes with spiny skin; exclusively marine organisms
- 14. The layer of cells that lines the outer surface of an animal
- 15. an air-filled bone
- 17. the layer of cells that lines the gastrovascular cavity of cnidarians
- 19. frogs, salamanders, and caecilians
- 22. Having no plane of symmetry
- 24. An animal that does not have a backbone
- 26. a system in echinoderms in which water is the circulatory fluid
Down
- 1. a fused head and thorax
- 2. the central cavity bounded by the gastrodermis in cnidarians
- 5. the shape and symmetry of an organism
- 7. an amoeba-like cell of sponges whose functions include distribution of nutrients to other cells in the sponge
- 10. specialized gills in mollusks
- 11. a typos of symmetry where there is only one plane of symmetry that creates two mirror-image sides
- 13. Having two genders
- 16. An animal that has a backbone
- 18. a form of asexual reproduction in which a portion of the body of an organism breaks off and develops into a living independent organism; found in plants, sponges, and some other invertebrates
- 20. a jawed fish
- 21. humans, monkeys, lemurs, and apes
- 23. a lined body cavity derived from mesodermal embryonic tissue
- 25. an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates