Across
- 2. phylum consisting of vertebrates
- 5. mammals that lay eggs
- 8. monophyletic group distinguished by overlapping scales
- 9. putting others' well-being before one's own
- 12. undergoing complete metamorphosis
- 13. clade comprised of reptiles, birds, and mammals
- 14. developmental stage characterized by the induction of the 3 germ layers
- 15. small phylum comprising of virtually indestructible micro-organisms
- 17. outermost germ layer
Down
- 1. comprised of 3 germ layers
- 3. genetics system whereby fertilized eggs generate females while unfertilized eggs generate males
- 4. skeletal support rod
- 6. mammals that birth underdeveloped offspring
- 7. comprised of 2 germ layers
- 10. likely representative of the evolutionary transition from water (fish) to land (reptiles)
- 11. cell type with a flagella surrounded by a "collar" of microvilli
- 16. body cavity containing intestines and most organs