Across
- 4. COMPETITION among individuals of different species
- 5. Geezer who thought up natural selection together with Wallace
- 6. Single cells/ colonies of single cells
- 7. Due to limited resources
- 8. Lives in extreme environments
- 10. Burning of carbon
- 11. Nitrogen fixing bacteria live here
- 13. Ultimate source of energy in the majority of food chains
- 14. Species tells us about the environment
- 15. The grouping of organisms
- 17. DARWIN recognised the presence of this in populations
- 18. Both species benefit
- 19. Eats animals
- 20. An example of a fish perfectly adapted to upland streams and rivers
- 22. Characteristics allowing organisms to survive in their environment
- 24. Carbon dioxide and methane contribute to the ____________ effect
Down
- 1. How to write genus and species
- 2. Bottom of the food chain
- 3. mass of living material
- 4. Relationships between animals that depend on each other
- 6. Fixing of carbon from the atmosphere
- 9. One species suffers at the benefit of another
- 12. Produces fertile offspring
- 14. Animals without backbone
- 16. Below this, species are endangered (population/ habitat)(8,5)
- 21. Below kingdom
- 22. Haber process converts nitrogen gas to ___________
- 23. Pyramid may well not be pyramid shaped!