Evolution

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Across
  1. 2. the study of where in the world plants and animals live
  2. 6. great age of the planet, the geological time scale is broken down into chunks of different time lengths
  3. 8. Sedimentary rock forms in layers
  4. 10. A diagram can show all the members of a clade, including the common ancestor
  5. 12. rock
  6. 14. dating Estimating the age of rocks or fossils in (millions of) years
  7. 15. often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring,
  8. 16. the result of natural selection which the characteristics that are selected for, are determined by the specific selective pressures of the environment.
Down
  1. 1. evolution when one ancestral species evolves into one or more new species, also known as adaptive radiation
  2. 3. Radioisotopes decay to stable atoms at a known rate
  3. 4. change in heritable characters of a population or species over time
  4. 5. morphology Comparing structures of two different species
  5. 7. A phylogenetic tree shows the evolutionary history of a species or group of species
  6. 9. Different animals can be compared at different stage of development
  7. 11. fossil show evidence of organisms that shared characteristics with both the ancestral (ancient) form and the descendant (more modern) form
  8. 13. the process of forming a fossil from a living organism