Across
- 6. humans breed or decide what traits will be passed on
- 7. gradual change in species over time
- 8. small variations in a population over time
- 9. a species no longer has known living individuals
Down
- 1. bones in different animals showing they have a common ancestor
- 2. any difference in individuals of same species
- 3. certain traits help an individual survive and reproduce
- 4. big change with new species made over time
- 5. able to survive and reproduce