Natural Selection

3. An organism's ability to survive and reproduce in a particular environment.
4. of the fittest, Phrase used to describe natural selection.
9. pressure, Environmental factor that influences reproductive success.
13. Trait that improves an organism's ability to survive and reproduce.
16. record, Historical remnants of organisms that provide evidence for evolution.
17. structures, Body parts that are similar in structure but different in function due to common ancestry.
18. Last name of the scientist who proposed the theory of evolution by natural selection.
19. Interaction between organisms where they compete for resources.
20. pool The total collection of genes in a population at any one time.

1. selection Selective breeding by humans to promote desirable traits.
2. Interaction where one organism hunts and consumes another.
5. Different version of a gene.
6. Process by which new species are formed.
7. selection, Mechanism of evolution in which individuals with favorable traits are more likely to survive and reproduce.
8. Differences among individuals in a population.
10. Random change in DNA that may lead to variation.
11. drift, Random changes in allele frequencies that occur in small populations.
12. ancestor, An ancestral species from which two or more species evolved.
14. Change in the heritable traits of a population over generations.
15. with modification, Another phrase Darwin used to describe evolution.