Seeing is believing

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Across
  1. 2. invented character of books
  2. 3. occupation to make money
  3. 5. dangerous sea animal
  4. 6. half fish half man
  5. 8. a person who writes books
  6. 10. a group of people who work together
Down
  1. 1. a scientist who studies living organisms
  2. 4. a girl who looks after the sick and helps doctors
  3. 7. place for marine creatures
  4. 9. a person who treats the sick