Across
- 6. beginning of existence
- 9. energy released in the form of particle
- 11. survival and reproducion
- 13. a group of species separate from others
- 14. remains of plants and animals
- 15. organism adjusted to their environment
Down
- 1. the separation of species by physical barriers like water forms
- 2. a thought out explanation
- 3. development is marked by isolation
- 4. a change in a living organism
- 5. having the same structure
- 7. variety of life on earth
- 8. structures that have no apparent function
- 10. medium sized bird
- 12. organism adjust to new environment