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