Across
- 3. organisms that are suited to survive
- 4. major divisions of Earth's history
- 5. Cenozoic Era is divided by these
- 9. different surroundings for organisms
- 10. clues to how organisms lived different time
- 11. environments that died out or this
- 13. when continents collided or separated
Down
- 1. evolution gradual change in life forms
- 2. plate tectonics=separation and collision of
- 6. major division may be divided into these
- 7. organisms that produce among selves
- 8. scale divisions of Earths history units
- 12. species that couldn't adapt to world