Across
- 6. 20% of world oxygen is produced
- 7. leads the rise in world temperature
- 9. triggers the collapse of environment
- 10. releasing harmful substances to environment
Down
- 1. require balance of all species to maintain
- 2. species facing a risk of extinction
- 3. can be influenced by human activities
- 4. variety of species found within a region.
- 5. creation of calsium, keystone species of ocean
- 8. released from cows, causing tempreature increse