Invertebrates

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Across
  1. 3. Animals like crabs and spiders (10 letters)
  2. 6. A group of mollusks with eight arms (7 letters)
  3. 7. Starfish belong to this group (11 letters)
Down
  1. 1. Invertebrates with stinging cells (7 letters)
  2. 2. The outer skeleton of arthropods (10 letters)
  3. 4. Invertebrates with no real body shape or organs (8 letters)
  4. 5. Group that includes snails and squids (8 letters)