Counting Whales

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Across
  1. 2. a specialist in biology
  2. 4. to make an approximate judgment, to guess
  3. 8. large marine animals
  4. 10. the total number of inhabitants in one place
  5. 11. an argument outlining positive and negative points
Down
  1. 1. to chase or search for, for the purpose of killing
  2. 3. ocean spanning 20 million square kilometres
  3. 5. a small part studied to get general data
  4. 6. facts, statistics, items of information
  5. 7. unable to be seen
  6. 9. where whales come to breathe