Across
- 2. species experience changes in characteristics slowly and incrementally
- 7. First step of natural selection - Every population can produce more offspring than can survive
- 10. First released lots of oxygen into the atmosphere
- 11. Classification of animals ranging from kingdom to species
- 15. favors one extreme of a trait
- 17. Inherited traits that increase the chance of survival
- 19. Evolutionairy relationships among organisms, shows how much time has passed
- 20. A structure left over from evolution that no longer serves a purpose
- 21. favors both extremes of a trait
- 22. Proposed theory of descent with modification
Down
- 1. _______ Selection passes on traits beneficial to the environment to be passed
- 2. _________ isolation causes speciation as a result of geographic barriers
- 3. ___________ isolation is caused by differences in behavior
- 4. Genetic _____ - individuals leave a population resulting in certain alles being favored
- 5. Believed that Complex organisms descend from less complex organisms
- 6. _______ structures - structures inherited from similar ancestors but used differently
- 8. proposed theory of evolution
- 9. _____ evolution - large scale evolution over a long time period
- 10. Group of organisms including its ancestor and all descendants
- 12. ________ evolution - common ancestry but different adaptations due to natural selection
- 13. Organizes organisms based off of shared characteristics
- 14. one species is the ancestor of two or more species later in time
- 16. favors average trait
- 18. __________ isolation is caused by breeding at different times/seasons