Across
- 6. A change in DNA sequence
- 9. Change in a species over time
- 13. Humans choosing traits to reproduce desired offspring
- 16. A group of organisms that can breed and produce fertile offspring
- 17. External factors that affect an organism’s survival
- 19. Genetic material that determines traits
- 20. Formation of new species
Down
- 1. Body parts with similar functions but different structures
- 2. A trait that helps an organism survive and reproduce
- 3. Process where the fittest survive and pass on traits
- 4. Remains or traces of organisms from the past
- 5. Body parts with similar structures but different functions
- 7. Struggle between organisms for limited resources
- 8. Chronological collection of fossils showing change over time
- 10. Body parts that have lost their original function
- 11. An ancient organism from which later species evolved
- 12. When populations are separated and can’t interbreed
- 14. Differences in traits among individuals of a species
- 15. Study of embryos and their development
- 18. When a species no longer exists