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