Natural Selection

3. Any change in the DNA of a gene or a chromosome
4. allele An allele that is hidden whenever the dominant allele is present
9. Change over time
10. selection The process where humans breed only organisms with desired traits
11. record All the fossils that have been discovered and what scientists have learned from them
13. An inherited behavior or physical characteristic that helps an organism survive and reproduce in its environment

1. An organism's physical appearance, or visible traits
2. The struggle between organisms to survive as they attempt to use the same limited resources in the same place at the same time
5. Any difference between individuals of the same species
6. selection The process by which organisms that are best adapted to their environment are most likely to survive and reproduce
7. The passing of traits from parents to offspring
8. The preserved remains or traces of an organism that lived in the past
12. theory A well-tested explanation for a wide range of observations or experimental results