YES, I KNOW IT

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Across
  1. 5. I can live on land as well as in water.
  2. 6. I use this action to move quickly, even though I don't have any legs
  3. 7. My body is moist and made up of many segments.
  4. 8. I am a livestock animal.
  5. 9. I am a Mollusca, who breathes through a hole in my shell.
Down
  1. 1. I have tentacles and come in many shapes and sizes
  2. 2. It is believed asteroids caused my extinction.
  3. 3. I am a mammal who lives in the desert.
  4. 4. I am a dual- purpose animal.
  5. 5. I usually have 8 legs and 2 body parts.