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