NATURAL SELECTION

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Across
  1. 3. Inheritance, The passing of helpful traits from parents to offspring
  2. 5. to survive and reproduce.
  3. 7. helpful traits are most likely to survive.
  4. 9. The concept that animals have more young than can
  5. 11. for.
  6. 14. The slight differences that exist among offspring.
  7. 16. selection.
  8. 18. The long period over which natural selection causes species to
  9. 21. The process where animals with helpful traits are more
Down
  1. 1. Things like food, water, shelter, and mates that animals
  2. 2. The young of an animal.
  3. 4. The struggle among offspring to survive due to limited
  4. 6. The number of a specific species in a given area.
  5. 8. genes.
  6. 10. of the Fittest, A phrase that describes how animals with the
  7. 12. The change in species over many generations due to
  8. 13. Characteristics or features of an animal.
  9. 15. Helpful traits that increase an animal's chances of
  10. 17. animals with helpful traits survive and pass those traits to their
  11. 19. A group of similar animals that can reproduce.
  12. 20. Selection, The process by which species change over time,