CH10-Animal Classification

1. sea urchins and other marine animals with radial symmetry and spiny skin
3. these type of animals have the ability to exchange oxygen and carbon dioxide through their skin
6. long, soft-bodied animals with bilateral symmetry
8. butterflies, crabs, and scorpions are all ___
10. this structure attaches an embryo to a placenta
12. leeches are ___ worms because it has repeating body divisions that contain the same set of organs
14. this animal is a "pore-bearer"
15. unlike other reptiles, ___ have a four-chambered heart
16. stinging cells that cnidarians use to capture food
19. invertebrates with jointed appendages are called ___
21. invertebrates (except for cephalopods) that rely on hard shells for protection
23. all ___ have backbones, endoskeletons, and skulls
24. an animal that can regulate its inner body temperature
25. spiders, scorpions, and other arthropods with two body segments and eight legs
29. comes from the Hebrew words meaning "created kind"
30. all animals are ___

2. invertebrates without symmetry, cephalization, or guts
4. a chelicera is a type of ___
5. lampreys and hagfish differ from other fish because they have no ___
7. periodic shedding of skin by squamates is called ___
9. sharks and rays are examples of ___ fish
11. are best described as animals that at some point during their lives have a notochord
13. the only invertebrates that can fly
17. arthropods with either eight or ten legs
18. an animal with a ___ has a digestive system with two openings
20. means that an animal has sensory organs and a brain concentrated at one end
22. a lobster is considered an invertebrate because it has no ___
26. snakes often need sunlight to warm their bodies because they are ___
27. the type of symmetry jellyfish have
28. includes jellyfish and coral