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Across
  1. 4. the term used in genetics for the composite observable characteristics
  2. 5. Selection Process by which organisms with traits that better enable them to adapt to their environment will tend to survive
  3. 7. Cell It exists around 3.5 billion years
  4. 8. a scientist who studies the history of life on Earth
  5. 9. Process by which a new species evolves.
Down
  1. 1. a person who studies human history
  2. 2. Something left behind by a once-living organism
  3. 3. Traits Feature passed from one generation to the next.
  4. 6. the genetic constitution of an individual organism.
  5. 10. Darwin English naturalist who developed the theory of evolution by natural selection.