Across
- 4. theory where evolution occurs slowly
- 5. idea that over time species evolved into new species
- 10. a technique to determine what two fossils are older based on the layer of rock they were found
- 11. a method used to test concepts explaining a range of observations
- 12. if an organism can survive well and reproduce in its environment
- 14. going into or out of a population
- 15. fossils scientists collect
Down
- 1. parts of the body that are similar structure in a related species providing evidence for a common ancester
- 2. individuals that are best adapted for the environment and are more likely to survive compared to others of that species
- 3. differences between multiple individuals in the same species
- 6. Person who created a theory of evolution
- 7. potential for species to have too many offspring
- 8. expansion of particles
- 9. the last shared common ancestor on the branching tree of evolution
- 13. limited supply of resources needed for life