Across
- 2. Is a British scientist and naturalist who is best known for his theory of evolution by natural selection.
- 8. Book explains evolution by means of natural selection.
Down
- 1. A process that causes species to evolve over time.
- 3. Species gradually changes over many generations.
- 4. Trait that allows an organism to survive and reproduce.
- 5. Group of similar organisms that can produce offspring.
- 6. A change or difference in a species.
- 7. Preserved remains of traces of an organism that lived in the past.