All about Complex Animals

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Across
  1. 2. A reaction that absorbs heat is a ____ reaction
  2. 3. An organism that produces its own heat
  3. 6. If you don't have enough of this in your blood, you might get dizzy or faint.
  4. 8. Another word for a stable internal environment
  5. 10. An organism that has to depend on its environment for heat
  6. 11. This phylum contains complex animals with backbones
  7. 14. A reaction that releases heat is a ____ reaction
Down
  1. 1. Endotherms can produce their own body heat because of their ____ cells
  2. 4. Reptiles have ______ heart chambers
  3. 5. The process that water dwellers use to control their water and salt levels
  4. 7. Tunicates and lancelets don't have vertebrae. They have a ______
  5. 9. Mammals have _____ heart chambers
  6. 12. When you don't have stable blood glucose levels, you can develop this disease.
  7. 13. Birds evolved from this group of dinosaurs