Change Over Time Part 2

2. One of the first scientists to suggest that animals have changed through history and offer a theory as to how they have changed.
4. The same structure used differently by different species. Suggesting a similar origin
7. A type of isolation where two groups of organisms are not able to reproduce due to genetic differences
9. Organisms that look similar and can reproduce and have fertile offspring.
10. When species change so much they become two different species
11. The same species eventually evolves into different species.
12. A critters ability to survive and reproduce.
14. A new population develops that only has SOME of the traits of the original population.
15. A type of equilibrium in which the traits of a population of critters stays constant.
16. A type of isolation that involves the separation of species by a physical barrier
20. Structure in a critter that no longer has a function. Demonstrating how a species has changed.

1. Structures that form due to similar selective pressures in the environment.
3. Different species looking similar under similar environments
5. The random change to a population that results in the loss of a trait or a large increase in a trait.
6. A trait that is passed down from the DNA of the parent critters.
8. When two groups are separated from one another by any means.
10. Type of pressure that determines the fitness of a trait or a critter in general.
13. List of 5 principles describing the necessary conditions for the traits in a population to remain unchanged.
17. A trait that is gained during an animals lifetime.
18. The random change to DNA that can ultimately help, harm or have no effect on a critter.
19. Wrote the book, The Origin of Species, which described how critters may have changed through a process known as natural selection.