Across
- 2. a slight different in an inherited trait of individual members of a species
- 3. someone who studies plants and animals by observing them
- 8. the breeding of organisms for desired characteristics
- 11. impression of an organism in a rock
- 12. body parts that perform a similar function but differ in structure
- 14. the science of the development from fertilization to birth
- 15. body parts that have lost their original function through evolution
- 16. the study of similarities and differences among structures of living species
- 21. a rock is either older or younger than rocks nearby
- 22. the resemblance of one species to another
- 23. an adaptation that enables a species to blend in with its environment
- 24. occurs when the individual organism of a species dies
Down
- 1. the process by which population of organisms with variations that help them survive in their environments live longer, compete better, and reproduce more than those that do not have the variations
- 4. more precise ages of fossils
- 5. fossil forms when organism’s remains are buried under mud, sand or other sediments in a stream or river, minerals in the water replace the organisms original material and harden into rock
- 6. the fossil copy of an organism in a rock
- 7. a chart that divides Earth's history into units
- 9. body parts of organisms that are similar in structure and position but different in function
- 10. is made up of all the fossils ever discovered on Earth
- 13. the change over time in populations of related organisms
- 17. evidence of an organism’s movement and behavior
- 18. an inherited trait that increases an organism's chance of surviving and reproducing its environment
- 19. when the original tissues of an organism is preserved
- 20. fossil forms when a dead organism is compressed over time and pressure drives off the organism's liquids and gases