Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Science Biology Ecology & Environment
Which one among the following is responsible for formation of "Ozone Holes" in the atmosphere?
1
Benzopyrene
2
Hydrocarbons
3
Chlorofluorocarbons
4
More than one of the above
5
None of the above