Change Over Time

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Across
  1. 4. living
  2. 8. a group of the same species in an area
  3. 9. differences in a trait
  4. 13. when organisms change in order to survive in their environment
  5. 14. of descendants organisms that can be traced directly to organisms in the past through parent/offspring relationships
  6. 16. the average of a data set
  7. 18. a characteristic or feature
  8. 19. similar organisms that can reproduce together to have offspring
  9. 20. time scale a scale that divides up the history of the earth based on life-forms that have existed during specific times
Down
  1. 1. inherited genetically
  2. 2. when a population within a species separates and develops its own unique traits
  3. 3. ancestor a species that is the ancestor of 2 or more species in later times
  4. 5. not living
  5. 6. record the total number of fossils that have been discovered as well as the information that can be determined from them
  6. 7. the preserved remains of ancient organisms
  7. 10. variations of a gene
  8. 11. selection organisms with favorable traits for an environment survive and go on to reproduce
  9. 12. when a population in a species separates and develops its own unique traits
  10. 15. part of a population
  11. 16. any small change that happens to the structure of a chromosome that can be passed on to future offspring but wasn’t there before; may lead to new alleles for a gene
  12. 17. locations on a chromosome that determine traits