Sudden mass death of fishes from oxygen depletion is more likely in case of:

Sudden mass killing of fishes is likely in:

The sudden mass killing of fishes is likely to be seen in a :

Oil slick causes mass scale death of fishes due to

Oil slick causes mass-scale death of fishes due to

Oil slick causes mass-scale death of fishes due to

The sodden mass killing of fishes is likely to be seen in a

[A] : Problems of ecological environment arise from over population. [R] : Over population results in depletion of natural resources more quickly and cause pollution also .