evolution words

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