Comparative anatomy

3. – The molecule that carries genetic instructions in all living things
8. – The study of the structure of organisms
9. – A structure that has lost its original function over evolutionary time
10. – Type of anatomy that compares structures across species
13. – The process by which species change over time
14. – A characteristic that helps an organism survive and reproduce in its environment
16. – An organism from which others have descended
17. – The bones or internal structure of an organism
18. – Groups of organisms capable of interbreeding and producing fertile offspring

1. – A primate species closely related to humans
2. – A class of warm-blooded animals with hair or fur
4. – A type of limb structure with five digits
5. – Structures that perform similar functions but evolved independently
6. – Structures in different species with a common ancestor but different functions
7. – The vertebral column
11. – A sequence of species each descended from the last
12. – An arm, leg, or wing—used for movement in various species
15. – A marine mammal that evolved from land-dwelling ancestors