Evolution Basics

2. Type of animal Darwin studied on the galpagos islands.
3. A group of organisms capable of interbreeding and producing fertile offspring.
5. A unit of heredity that is passed down from parent to offspring.
9. A trait that helps an organism survive and reproduce in its environment.
10. The measure of ability of an organism to survive and reproduce in its environment.
12. The surroundings and conditions in which an organism lives.
14. Differences in traits among individuals of a species.
15. The struggle among organisms for limited resources.

1. The variety of different species and traits within an ecosystem.
4. The complete disappearance of a species from Earth.
6. A random change in an organism's DNA that can lead to variation.
7. Scientist known for his theory of evolution by natural selection.
8. The process where DNA strands are broken and repaired to form new, mosaic combinations of alleles.
11. The process by which certain traits are favored for survival and reproduction.
13. Remains or traces of organisms from the past preserved in rock.