Evolution and Natural Selection

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Across
  1. 1. the study of embryos and their development
  2. 3. evolution of similar structures or traits in unrelated organisms is
  3. 4. structures that serve no purpose and are left from ancestors
  4. 8. adjusting to new/different conditions individually and quickly
  5. 10. change over time
  6. 11. two species evolve together influencing one another
  7. 13. a few organisms separate from the rest and grow a new population with different genetic variation than the initial.
  8. 15. made the theory of evolution
  9. 17. evolution of differing traits in species with common descent
  10. 18. the dying out of a species
  11. 19. asexual reproduction in which cell divides
  12. 20. environmental factors that cause different traits to be more favorable
Down
  1. 2. size of a population is severely reduced causing new genetic variation.
  2. 5. structures that are different but have formed to function similarly in similar environments
  3. 6. have a membrane-bound nucleus
  4. 7. the increasing of a favorable trait is due to
  5. 9. a group within a species separates and develops its own characteristics.
  6. 12. lacks a nucleus and membrane-bound organelles
  7. 14. structures that are made similarly due to shared ancestors
  8. 16. lowest taxonomic level