EVOLUTION

5. organs that serve no useful function in an organism.
7. 1795 Theory of Geological change
9. theory of tendency toward Perfection.
11. struggle for members of each species have to compete for food, shelter, other life necessities.
13. were derived from common ancestors.
15. variation of differences among individuals of a species.
17. descent of each living organism has descended, with changes from other species over time.
18. smallest island, lowest islands were hot, dry, and nearly barren-Hood Island-sparse vegetation.
20. Principles of Geography

1. structures that have different mature forms in different organisms.
2. survival of some individuals better suited for the environment.
3. a science born in the 20th century, reveals in detail how natural selection works.
4. layer show change Geographic Distribution of Living Things.
6. change over time.
8. selection of nature provides the variation among different organisms.
10. wrote an essay summarizing evolutionary change from his field work in Malaysia.
12. one of the fundamental keystones of modern biological theory.
14. collected the preserved remains of ancient organisms, called fossils.
16. remains of ancient organisms.
19. selection of results in changes in inherited characteristics of a population.