Natural Selection

2. The number of a specific species in a given area.
8. The concept that animals have more young than can survive.
9. The long period over which natural selection causes species to change.
10. Things like food, water, shelter, and mates that animals compete for.
11. The young or children of an animal.
13. The process by which species change over time, where animals with helpful traits survive and pass those traits to their offspring.
14. Characteristics or features of an animal.
15. A group of similar animals that can reproduce.

1. The slight differences that exist among offspring.
3. The passing of helpful traits from parents to offspring through genes.
4. The struggle among offspring to survive due to limited resources.
5. Helpful traits that increase an animal's chances of survival.
6. The change in species over many generations due to natural selection.
7. A phrase that describes how animals with the most helpful traits are most likely to survive.
12. The process where animals with helpful traits are more likely to survive and reproduce.