Colin's Evolution and Natural selection crossword puzzle

1234567891011121314151617181920
Across
  1. 2. evolution occurs when descendants of a single ancestor diversify into species that each fit different parts of the environment.
  2. 4. diagram that show common characteristics between organisms or evolutionary relationships.
  3. 9. amount of a certain species
  4. 10. When organisms seem outwardly similar due to adapting to similar environments. Not good evidence to support evolutionary relationships
  5. 12. When bone/organ structures are similar due to common ancestry. Very good evidence to support evolutionary relationships
  6. 13. the ability an organism has to survive changes in it's environment
  7. 16. is a change in the gene pool of a population due to chance.
  8. 18. is genetic drift that occurs when a few individuals become isolated from a larger population.
  9. 20. occurs when different species evolve similar traits, essentially resulting in unrelated species becoming more similar as they adapt to similar environments.
Down
  1. 1. reduces differences between populations
  2. 3. when you have a similar trait as one of your parents you blank that trait
  3. 5. a event in an environment that causes a dramatic decrease in population
  4. 6. species of bird that underwent natural selection
  5. 7. selection the change in population of a species due to a change in the environment giving certain traits a competitive advantage
  6. 8. Structures that no longer serve their original purpose but are still present. Are often homologous to structures still present/working in other organisms. Evidence for evolutions
  7. 11. The change in two or more organisms in close association with each other. Examples may include: parasite and host relationships, prey-predator relationships, or flower-pollinator.
  8. 14. when a population of a species with a certain trait that helps them survive, they have a blank
  9. 15. differences in traits of a species of organisms
  10. 17. the changing of an organism overtime due to natural selection
  11. 19. provides the most reliable evidence for inferring evolutionary relationships and how closely two organisms may be related to one another.