Question

Tick the odd one out giving reason.
1. Oceans, Rivers, Lakes, Polar regions, Spring.
2. Dams, Hydroelectricity, Irrigation, Evaporation.
3. Air, Oxygen, Nitrogen, Nitrogen dioxide, Water Var
4. Birds, Human beings, Mammalian animals, Fish.​

Answer 1

1. polar regions.bcoz all others are water resources
2. evaporation. bcoz dams and hydroelectricity helps irrigation
3. water var
4. fish.bcoz all others belong to mammalia