Across
- 4. study of classification/biology of fish
- 8. intestines of cartilaginous fishes
- 10. cover gill filaments
- 11. toxic compound from protein breakdown
- 12. cells
- 14. whisker-like organs
Down
- 1. females first then develop into males
- 2. pump blood throughout body
- 3. series of pores and canals
- 5. do this to prevent dehydration
- 6. where undigested material exits
- 7. detect chemical compounds in the water
- 9. males first then develop into females
- 13. detection of electrical charges