Biology Chapter 5: Evolution Crossword

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Across
  1. 2. The change in the characteristics of living things over time.
  2. 5. The evolution over a short period of time within a small population of just one species.
  3. 6. A period of the paleozoic era when large plants on land created huge amounts of carbon that later became coal.
  4. 7. Formed when an organism lives with another organism.
  5. 8. Structure found in an organism that has no obvious use.
  6. 11. A period of the paleozoic era when all animals were invertebrates and lived in the oceans.
  7. 12. The first period of the paleozoic era when there was an explosion of new life.
  8. 13. A supercontinent that existed during the late Paleozoic and early Mesozoic eras.
Down
  1. 1. Era that occurred 544-245 million years ago.
  2. 2. When all organisms of a particular species die.
  3. 3. Era that occurred to billion years ago to about half a billion years ago.
  4. 4. The largest and most inclusive taxa in the original Linnaean classification system.
  5. 5. Major evolutionary change. The term applies mainly to the evolution of whole taxonomic groups over long periods of time.
  6. 9. A group of organisms in a classification system.
  7. 10. A common ancestor and its descendants.