Change Over Time Part 2

1. A type of isolation that involves the separation of species by a physical barrier
4. Wrote the book, The Origin of Species, which described how critters may have changed through a process known as natural selection.
5. A trait that is gained during an animals lifetime.
8. Structure in a critter that no longer has a function. Demonstrating how a species has changed.
9. Different species looking similar under similar environments
12. A new population develops that only has SOME of the traits of the original population.
13. A type of equilibrium in which the traits of a population of critters stays constant.
14. Structures that form due to similar selective pressures in the environment.
18. A type of isolation where two groups of organisms are not able to reproduce due to genetic differences
20. One of the first scientists to suggest that animals have changed through history and offer a theory as to how they have changed.

1. The random change to a population that results in the loss of a trait or a large increase in a trait.
2. When species change so much they become two different species
3. A critters ability to survive and reproduce.
6. A trait that is passed down from the DNA of the parent critters.
7. The same species eventually evolves into different species.
10. List of 5 principles describing the necessary conditions for the traits in a population to remain unchanged.
11. The same structure used differently by different species. Suggesting a similar origin
15. Organisms that look similar and can reproduce and have fertile offspring.
16. The random change to DNA that can ultimately help, harm or have no effect on a critter.
17. Type of pressure that determines the fitness of a trait or a critter in general.
19. When two groups are separated from one another by any means.