Across
- 2. a trait passed on from one organism to another that helps the organism survive in an environment.
- 6. Structures in different species that are similar because of common ancestry.
- 8. The first famous philosopher to mention evolution
- 12. the formation of new and distinct species in the course of evolution.
- 13. similarities in gene sequences proteins and DNA used to determine common ancestry
- 17. observing them
- 18. An adaptation that involves internal body systems that affect biochemistry
- 20. a physical feature of an organism's body having a specific function that contributes to the survival of the organism
- 21. A scientist whos idea of evolution was very similar to Darwins
- 22. a type of biology that deals with organisms that are endangered and at risk.
- 23. A structure that is present in an organism but no longer serves its original purpose
Down
- 1. the process through which populations of living organisms adapt and change.
- 3. the change in the characteristics of a species over several generations and relies on the process of natural selection.
- 4. The preserved remains or traces of organisms that once lived on Earth.
- 5. an adaptation that enables a species to blend in with its environment
- 7. Body parts that share a common function, but not structure
- 9. English natural scientist who formulated a theory of evolution by natural selection (1809-1882)
- 10. an adaptation that involves the way an organism behaves or acts
- 11. a change or difference in condition, amount, or level, typically with certain limits.
- 12. the human practice of breeding animals or plants that have certain desired traits
- 14. An organism before it is born
- 15. when the last organism in a species dies.
- 16. The resemblance of one species to another species
- 19. A person who studies plants and animals