Across
- 2. Their bodies are laterally flattened, and the tail paddle-shaped for swimming.
- 5. That lay eggs in fresh water.
- 6. Have narrow wings and a long, forked tail.
- 10. a complex nucleic acid that contains a cell's genetic information.
- 11. Organisms that have a body temperature that varies with that of the environment.
- 15. Is a large pinniped with a pair of distinctive tucks protuding down from the mouth.
- 19. evolved from now-extinct amphibians
- 20. birds that spend a significant part of their lives at sea and feed on marine organisms.
- 22. Organisms that lose metabolic heat to the environment without it affecting their body temperature.
- 26. Four footed.
Down
- 1. Have unique pouch below their large beaks.
- 3. Organisms that retain some metabolic heat, which raises their body temperature.
- 4. The newborn is fed by milk secreted by mother's.
- 7. Comprise a large group or seabirds with distinctive tube-like nostrils and heavy beaks that are usually curved at the tip.
- 8. that do not have webbed feet.
- 9. Both evolved from different group of now-extinct reptiles.
- 12. Animals in which the eggs develop and hatch in the reproductive tract of females.
- 13. Organisms able to keep their body temperature more or less constant regardless of the temperature of the environment.
- 14. Venture into the open sea.
- 16. Internal air sacs that allow absorption of oxygen directly from air.
- 17. evolved from different group of now-extinct reptiles
- 18. Are graceful flyers that hover over their prey before plunging for it.
- 21. are flightless, with wings modified into stubby "flippers" that allow them to fly underwater.
- 23. Are black, long necked seabirds that dive and purse their prey.
- 24. A membrane that connects it to the womb.
- 25. To keep warm they have a thick layer of fat under their skin.