Natural Selection

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Across
  1. 6. Preserved remains found in the ground
  2. 8. Natural selection is also known as the survival of the_
  3. 9. selection Evolutionary change occurs through variation between individuals
  4. 10. When animals disappear from the earth
  5. 12. Evolutionary change occurs through incremental small changes within populations
  6. 13. An individual animal, plant, or single-celled life form
  7. 14. descent Organisms are descended from one, or several common ancestors referred to as_
Down
  1. 1. The different physical forms a trait may have
  2. 2. selection The selection of traits based on their role in courtship and mating
  3. 3. Change over time
  4. 4. selection Selection by humans for desired traits
  5. 5. darwin Proposed the theory of evolution by natural selection
  6. 7. A particular characteristic of an individual plant or animal
  7. 11. A characteristic that helps an organism survive