6. The Earths atmosphere today contains approximately 78% of...
- carbonates
- argon
- nitrogen
- carbon dioxide
- neon
7. The earth was a molten ball of....
- rock and water
- rock and minerals
- lava and rock
8. animals evolved using ...
- oxygen to respire
- carbon dioxide to photosynthesies
- oxygen to photosynthesies
- carbon dioxide to rispire
