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Across
  1. 3. The preserved remains or traces of animals, plants, and other organisms from the remote past.
  2. 7. any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment.
  3. 8. the genesis or development of the human race, especially as a subject of scientific study.
  4. 9. evolutionary change involving the gradual accumulation of mutations leading to new varieties within a species.
Down
  1. 1. Study the record of life on Earth left as fossils.
  2. 2. passing from a more complex to a simpler structure.
  3. 4. the gradual change in form from one type to another during the evolution of a group of organisms.
  4. 5. the development or evolution of a particular group of organisms.
  5. 6. The study of the history of life on Earth as reflected in the fossil record.
  6. 7. dating from a remote period