Across
- 4. the last universal common ancestor
- 5. thought to be the single land mass of the ancient world
- 8. a process by which evolution occurs
- 9. selective agents involving living things
- 10. the range of alleles for a trait in a population
- 12. variation within living things
Down
- 1. Carolus Linnaeus' naming system
- 2. a group of the same species in the same place and time
- 3. a characteristic that assists survival
- 6. one species' evolution in response to another's
- 7. external factors that determine your survival
- 11. evolution of two species from a shared ancestor