Across
- 5. Features in different species that have similar structures due to a common ancestor.
- 7. When two related species become more different due to different environmental pressures.
- 11. The gradual change of species over time through genetic variations.
- 12. The process by which organisms better suited to their environment are more likely to survive and reproduce.
- 14. When populations of a species are separated by physical barriers, leading to the formation of new species.
- 16. Fossils that show evidence of an organism's activity, such as footprints or burrows.
- 18. When unrelated species evolve similar traits due to similar environmental pressures.
- 19. The process where a species evolves into many different forms to adapt to different environments.
- 20. A change in a species over time that helps it survive in its environment.
- 21. Features in different species that have similar functions but do not come from a common ancestor.
Down
- 1. The formation of new species due to physical barriers that separate populations.
- 2. A fossil used to define and identify a particular time period.
- 3. The formation of new species in the same geographic area due to differences in behavior or ecological niches.
- 4. When two species reproduce at different times, preventing interbreeding.
- 6. The process where two or more species influence each other’s evolution.
- 8. When two populations of the same species can no longer interbreed due to differences in behavior, time, or location.
- 9. The study of the development of embryos from fertilization to birth.
- 10. Random changes in gene frequencies in a population over time, especially in small populations.
- 13. Charles Darwin, a scientist known for developing the theory of evolution through natural selection.
- 15. A close relationship between two different species, where at least one benefits.
- 17. The process by which new species are formed from existing species.