A4.1

2. The five-fingered limb structure found in mammals, birds, and reptiles.
3. Structures that are similar in different species due to common ancestry.
5. Speciation occurring within the same geographic area due to behavioral or temporal factors.
6. A dark-colored variant of an organism, like the peppered moth.
10. Differences between individuals of a population caused by mutation or meiosis.
11. The process where better-adapted individuals survive and pass on genes.
12. The theory that evolution occurs through small, steady changes over time.
13. The cumulative change in the heritable characteristics of a population.
15. Evolution that occurs when two species become increasingly different.
19. Artificial selection where humans choose specific traits for reproduction.
20. The state of being separated, preventing interbreeding between populations.

1. The theory that evolution consists of long stable periods followed by rapid change.
4. The process by which one species splits into two or more separate species.
7. Structures with similar functions but different evolutionary origins.
8. Speciation occurring due to geographic separation.
9. A heritable characteristic that enhances an organisms ability to survive.
14. Producing more offspring than the environment can support to ensure survival.
16. The ability of an organism to survive and contribute to the next generation.
17. The total collection of all genes and alleles in a population.
18. Organs or structures that have lost their original function through evolution.