Question

(8)
-11 प्राथमिक और द्वितीयक वायु प्रदूषक क्या हैं ? एक
What are primary and secondary air po
-12 जनसंख्या विस्फोट के प्रमुख कारण क्या हैं ?
What are the major causes of populatio​

Answer 1

I think this is the biological science

but I don't understand your question