Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test Biology Ecology and Environment Environment
What are the two forms of oxygen found in the atmosphere?
1
Water and oxygen
2
Ozone and oxygen
3
Water and carbon dioxide
4
More than one of the above
5
None of the above