Classification II - 6th grade

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Across
  1. 3. invertebrate with a porous, asymmetrical body that pumps and filters water
  2. 5. an invertebrate that exhibits radial symmetry and a tough, spiny skin
  3. 9. an animal that has the beginnings of a backbone during one or more stages of development
  4. 10. a strong, structural protein found in skin, hair, nails, and feathers
  5. 11. a hard, external covering of an animal
  6. 13. a mainly aquatic arthropod that has a hard exoskeleton and two pairs of antennae
  7. 14. an invertebrate with a soft body that is typically enclosed in a shell
Down
  1. 1. an invertebrate that has a segmented body, jointed appendages, and usually an exoskeleton
  2. 2. a large region that has a particular climate and specific plants and animals
  3. 4. invertebrate with radial symmetry, a soft body, and tentacles with stinging capabilities
  4. 6. a warm-blooded animal that maintains a constant internal temperature
  5. 7. a cold-blooded animal whose body temperature fluctuates with the temperature of its environment
  6. 8. an external structure that extends from the main body
  7. 12. the small pores through which water and nutrients enter a sponge