Stupid English task

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Across
  1. 2. body part
  2. 5. 100 years old people
  3. 7. mechanical
  4. 8. not from earth
  5. 9. proof
  6. 10. lively
Down
  1. 1. aligned
  2. 3. animals that give birth to living creatures (no eggs)
  3. 4. existence
  4. 6. sci-fi