Which type of animals are seen in polar regions? 

Protozoans, rotifers, larvae of insects, crustaceae and moluscs are 

________ are absent in areas with with water scarcity. 

Catalytic converters are used in 

Aestivation is during 

Soot and hydrocarbons from industries may cause

Trimethyl lead is formed by burning

Desert plants show adaptations to reduce which physiological process? 

Temperature in abyssal zone is 

Interaction between cow and lion is called