Across
- 1. similarities and differences between organisms living today and those in the fossil record
- 4. a scientist who studies prehistoric life
- 5. an organism from which other organisms evolved
- 6. the study of the structures of organisms and their parts
- 7. a predecessor than an organism shares with another organism
Down
- 2. the sequence of heritable changes that occurred among species since the origin of life on Earth
- 3. to change the frequencies of alleles in a population over time