Reviewer

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Across
  1. 2. remains of once-living organisms
  2. 3. study of variation and heredity
  3. 5. involves the movement of two feet
  4. 7. naming and classifying organisms
  5. 9. ribonucleic acid
Down
  1. 1. found inside the nucleus of a cell
  2. 2. union of male and female gametes
  3. 4. gradual accumulation of adaptation over time
  4. 6. deoxyribonucleic acid
  5. 8. change in the DNA sequence of an organism