Across
- 3. "Survival of the __________" is the term used to describes natural competition between organisms to survive and reproduce.
- 4. A characteristic by which a species becomes better suited to its environment.
- 5. The remains or traces of plants and animals that lived long ago giving clues about the past.
Down
- 1. A place and its environment where an organism lives.
- 2. "Natural __________" is the process by which organisms that are best adapted to their environment survive and reproduce while the least adapted die out.