Across
- 3. a sharp decrease in the number of species in a relatively short period of time
- 4. the movement of a population to a new geographic area
- 6. ex. Amish People
- 7. ex. relationship between a pollinator and it's flower
- 9. selection is against the mean
- 12. Spiders and silk moths can produce silken threads, but it is NOT believed that they share a common ancestor who could do so
- 13. selection is against both extremes
Down
- 1. selection is against an extreme
- 2. migration, occurs when individuals move into or out of a population
- 5. the way nature selects the most fit for the environment
- 8. the creation of a new species
- 10. random changes in allele frequencies in small populations
- 11. what new traits come from