Across
- 2. Many jointed legs, 2 per segment, scavenger
- 4. Invertebrates with jointed appendages & segmented bodies
- 7. warm-blooded vertebrates with feathers and beaks
- 10. "Double-life," metamorphosis, must live near water
- 12. rarest amphibians, no legs, live in soil
- 15. amphibians with tails, some retain gills
- 17. sharks, rays, skates
- 20. Simplest animal, sessile filter feeder
- 21. Arthropods with 3 body segments and 3 pairs of legs
- 23. most fish are this type with swim bladder
Down
- 1. invertebrates with stinging cells and 2 tissue layers
- 3. Arthropods with 2 pairs of antennae like lobster
- 5. Arthropods with 2 body segments, cephalothorax. Many have venom.
- 6. hair or fur, nurse their young with milk, warm-blooded
- 8. Most primitive fish such as lamprey
- 9. simplest worms, can regenerate, eyespots
- 11. skinned invertebrates like sea stars
- 13. Roundworms, many are parasitic
- 14. Scaly waterproof skin, amniotic eggs
- 16. Venomous myriapod predators with one pair of legs per segment
- 18. amphibians with no tail and powerful legs
- 19. invertebrates with muscular foot & mantle like clams
- 22. Segmented worms like earthworms, closed circulatory system