While India's Human population is growing at an astounding pace, the bird population is shrinking fastly mainly because:
1. there has been an abnormal increase in the number of hunters.
2. bio-pesticides and organic manure are being used on an large scale.
3. there has been a large scale reduction in the habitats of the birds.
4. there has been a large scale used of pesticides, chemical fertilizers and mosquito repellents.
Select your answer correctly using the codes given below:
Codes: