Water and Ecosystems

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Across
  1. 5. A fossil that is a copy of an organism’s shape
  2. 6. organism with a three lobed exoskeleton
  3. 7. The age of a rock compared to the ages of rock layers
  4. 8. an organism that no longer exists
  5. 9. A scientist who studies fossils
  6. 10. remains of a species that existed for a short amount of time
  7. 12. The process by which all the different kinds of living things have changed over time
Down
  1. 1. The age of a rock given as the number of years since the rock formed
  2. 2. A fossil in which minerals replace all or part of an organism
  3. 3. preserved remains or traces of living things
  4. 4. the collective group of fossils already discovered
  5. 11. The process by which all the different kinds of living things have changed over time