Evolution by Natural Selection

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Across
  1. 3. the remains or impression of a prehistoric organism
  2. 5. the dying out or termination of a species
  3. 6. the process in which organisms become better adapted to their environment overtime
  4. 7. an organ that served a purpose in the distant ancestor of an organism but is no longer pertinent in the presently existing, recently evolved, organism
  5. 8. intentional reproduction of individuals in a population that have desirable traits
  6. 10. technique that uses the decay of carbon-14 to estimate the age of organic materials
  7. 12. the formation of a new species caused by evolution
  8. 14. a branching diagram showing the cladistic relationship between a number of species
  9. 15. an organism's ability to survive and reproduce in a particular environment
Down
  1. 1. is the branch of life science concerned with the analysis of molecular sequencing data to study evolutionary relationships among groups of organisms
  2. 2. when an organism or population is able to survive a substance or situation that would harm a different individual or population
  3. 4. structures derived from a common ancestor
  4. 9. to become better suited to the environment
  5. 11. change in the genetic composition of a population due to chance or random events
  6. 13. a change in the gene pool of a population over time