Invertebrates and vertebrates

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Across
  1. 2. they have wings
  2. 3. a pair of antennae
  3. 5. they body is divided into two ring sections
  4. 6. they are sometimes in water
  5. 8. breath with gills
  6. 10. they have a tough exoskeleton
  7. 11. eight joint legs
Down
  1. 1. they have a exoskeleton
  2. 3. they have a muscular foot
  3. 4. six joint legs
  4. 7. they breath with lungs
  5. 9. they have scaled skin