Evolution

1. A type of selection where one extreme trait is the best fit for the environment
6. Prenatal study of the development and formation of an organism
7. A naturalist who developed the theory of evolution by natural selection
8. Differences in appearance and behaviors
10. _____ structures are similar structures with different functions that share a common ancestor
12. A type of selection where both extreme traits are the best fit for the environment
13. Explains how changes of evolution occurred to a group
15. A type of adaptation in which an organism's physical features allow it to survive its environment
18. An organism's ability to adapt and survive its environment
20. _____ structures have no function and appear to be residual parts from a past ancestor
22. A random genetic change in an organism
23. A gradual change in a population over time due to adaptations

2. When speciation occurs due to a population being geographically isolated from the main population
3. A type of adaptation where internal responses change due to external stimuli
4. Preserved remains used to study changes of organisms over time
5. A type of adaptation in where an organism changes its pattern of action to better suit its environment
9. Comparative _____ studies the differences and similarities in an organism's DNA sequence
11. A group of organisms that can reproduce with another one and produce fertile offspring
14. A trait that helps an organism survive and reproduce
16. Formation of a new species
17. A type of selection where the average trait is the best fit for the environment
19. When a new species evolves without a physical barrier separating them
21. Dying out of a species