Across
- 3. an animal that changes colour to keep them at the right temperature
- 4. preserved remains of organisms from millions of years ago
- 8. sleeping throughout winter and conserving energy
- 9. comes from external factors
- 11. section of DNA that holds the information to produce a characteristic
- 13. the differences within a species
- 15. part of the cell where DNA is stored
- 17. when species depend on each other
- 19. a process that helps an animal survive
- 20. type of tree that doesn't lose its leaves
- 21. comes from parents
Down
- 1. when animals and plants fight for a limited supply of resources
- 2. long strand of DNA that contains many genes
- 5. a group of similar organisms
- 6. something only plants compete for
- 7. a chemical that contains all the information needed to make an organism
- 10. population of organisms does not have the adaptations to survive in the environment
- 12. cause of extinction created by humans
- 14. moving somewhere with more food and a higher chance of survival
- 16. more species in an area means more ...
- 18. cause of extinction created naturally