Change Over Time Part 2

2. When species change so much they become two different species
5. The same structure used differently by different species. Suggesting a similar origin
7. The idea that species slowly changed over time.
8. A type of equilibrium in which the traits of a population of critters stays constant.
9. A critters ability to survive and reproduce.
11. A new population develops that only has SOME of the traits of the original population.
14. One of the first scientists to suggest that animals have changed through history and offer a theory as to how they have changed.
17. A type of isolation that involves the separation of species by a physical barrier
19. Structures that form due to similar selective pressures in the environment.
20. The random change to a population that results in the loss of a trait or a large increase in a trait.
22. Structure in a critter that no longer has a function. Demonstrating how a species has changed.
23. Wrote the book, The Origin of Species, which described how critters may have changed through a process known as natural selection.

1. A type of isolation where two groups of organisms are not able to reproduce due to genetic differences
3. When two groups are separated from one another by any means.
4. The random change to DNA that can ultimately help, harm or have no effect on a critter.
6. Organisms that look similar and can reproduce and have fertile offspring.
10. List of 5 principles describing the necessary conditions for the traits in a population to remain unchanged.
12. Different species looking similar under similar environments
13. The same species eventually evolves into different species.
15. A trait that is gained during an animals lifetime.
16. Type of pressure that determines the fitness of a trait or a critter in general.
18. The idea that species remain the same for a long time but occasionally make dramatic changes that cause a new species.
21. A trait that is passed down from the DNA of the parent critters.