Evolutionary History

4. to classify based on scientific examination
5. the process by which one population evolves into two or more different species
14. a related organism from a previous generation
15. an organism's arm, leg, or wing
16. a body structure in two or more species that features the same parts
17. a trait that makes it more likely that an individual will survive in a specific
18. a group of the same type of organism living in the same area
20. a part of an organism (for example, one or more bones)
21. the process by which the distribution of traits in a population changes over many generations
22. evidence of life from the past, such as fossilized bones, footprints, or leaf prints
23. a graph that uses bars to show how characteristics or values are distributed
27. the very long time that spans the history of Earth, from the very first cellular life to the present
28. to receive genes from a parent

1. a group of individuals born and living at about the same time
2. a more recent species that evolved from an ancestor population
3. a random change to a gene that sometimes results in a new trait
6. sharing a common ancestor population
7. having died out completely and no longer alive anywhere on Earth
8. everything (living and nonliving) that surrounds an organism
9. a group of organisms of the same kind (in one or more populations) that do not reproduce with organisms from any other group
10. an older population from which two or more newer species
11. the process by which species adapt to environmental changes over a very long time
12. living things, such as plants, animals, and bacteria
13. a scientist who studies fossils in order to understand the ancient history of life on Earth
19. a specific characteristic of an individual organism
24. when something stays mostly the same over time
25. example, the same bones)
26. a group