Natural Selection

2. A process where individuals best suited to their environment survive and pass on genetics
4. The permanent loss of a species, meaning no more individuals remain alive
5. A diagram representing evolutionary relationships between different species
7. A process where organisms over time develop advantageous traits better suited for their environment
8. Similar physical features in different species that share a common ancestor
11. A diagram representing the evolutionary history of a group of organisms
13. Another term for natural selection, where those best adapted to their environment survive
14. Differences between individuals of the same species
15. An evolutionary process where a new species arises from another species

1. Anatomical features or structures that were once functional in an organism's ancestors
3. Similar traits in different species with similar functions, but evolved separately
6. The physical separation of individuals due to natural barriers such as water, or mountains
9. The random fluctuation of allele frequencies within a populations gene pool
10. A group of organisms that can interbreed and produce fertile offspring
12. An organisms ability to survive and reproduce