Across
- 4. When a species no longer exists
- 6. The English Scientist that came up with the theory of natural selection
- 7. Differences between organisms of the same species
Down
- 1. A group of organisms (living things) that all live in the same area
- 2. Charles Darwin's famous theory
- 3. A group of similar organisms that can have babies
- 5. An idea that explains something