Seeing is believing

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Across
  1. 2. a group of people who work together
  2. 3. a marine mammal which looks like a sea cow
  3. 4. a marine fish with sharp teeth
  4. 5. a serious and dangerous situation when people need help
  5. 6. a person who saves human life
  6. 8. a place where fish live in captivity
  7. 10. a person who works in the field of biology
Down
  1. 1. a small air transport
  2. 3. a person who is in charge of an activity
  3. 7. a woman who has wings and uses magic
  4. 9. a person who writes books