Evolution is Change Over Time

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Across
  1. 4. An explanation based on evidence confirmed many times through observation
  2. 6. Structures that are similar in different species and have different functions
  3. 9. Traits passed down from one generation to the next
  4. 11. Change in species over a long period of time
  5. 13. A group of related organisms that can breed and produce fertile offspring
  6. 15. Dating of rocks based on carbon or potassium-argon
  7. 16. When species have to fight for resources to survive
  8. 18. An earlier relative shared with another species
  9. 19. Where nature selects which organisms survive to reproduce
Down
  1. 1. Remains of dead organisms that have been preserved
  2. 2. A tree diagram that shows evolutionary relationships among different species
  3. 3. Molecules made up of long chains of amino acids
  4. 5. Characteristics that make an organism well suited to a particular envrionment
  5. 7. Differences in gene traits from the blending of DNA from mother and father
  6. 8. Parts of the body that serve no purpose but may have in the past
  7. 10. Genetic molecule that codes instructions for our bodies
  8. 12. Where people select which characteristics to breed
  9. 14. Early stages of development where different species look similar
  10. 17. A species that no longer exists on Earth