Biology crossword

7. the variety of life in the world or in a particular habitat or ecosystem.
10. the natural world, as a whole or in a particular geographical area, especially as affected by human activity
11. the study of the relationships between living organisms, including humans and their envirorment
12. These fuels are found in Earth's crust and contain carbon and hydrogen

1. - the purposeful clearing of forested land.
2. a large naturally occurring community of flora and fauna occupying a major habitat
3. emissions - carbon dioxide gas going into the air.
4. - plants burned to generate electricity.
5. -the state of the air and atmosphere at a particular time and place
6. - recovering forested areas destroyed in recent times by planting new trees and sowing seeds from tree species, among other strategies.
8. a careful preservation and protection of something
9. warming - the gradual warming of Earth.