Evolution Key Terms Crossword

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Across
  1. 2. Estimating the age of rocks or fossils in (millions of) years.
  2. 5. A subdivision of geological time marked by significant fossil discoveries and evolutionary events.
  3. 7. Radioisotopes decay to stable atoms at a known rate.
  4. 8. All the members of a clade, including the common ancestor, can be shown in a diagram that has branches showing the new group or species that have evolved from the ancestral species and the order in which they have evolved.
  5. 10. The gradual change in species over time, as evidenced by fossils and genetic analysis.
  6. 11. Comparing structures of two different species.
  7. 12. The result of natural selection.
  8. 13. Study of where in the world plants and animals live.
  9. 15. The study of developmental stages in organisms, providing insights into evolutionary links observed in fossils.
  10. 16. Preserved impressions of an organism in the form of footprints/burrows/coprolites.
Down
  1. 1. One ancestral species evolves into one or more new species, sometimes called adaptive radiation.
  2. 3. A distinct group of organisms identifiable in the fossil record and central to studying evolutionary processes.
  3. 4. Layers of sedimentary rock.
  4. 6. The evolutionary history of a species or group of species
  5. 9. Layers of sediment that are compressed and glued together by chemical reactions and pressure.
  6. 14. Process of forming a fossil from a living organism.