Deforestation has an alarming effect on

$A$ : The soil of tropical rain forest has low base content.
$R$ : Such soil shows less percolation and leaching

Many fishes of freshwater can't live in sea water and vice -versa because of

Why mammals of the colder region generally have shorter ears and limbs?

$I.$ To minimize their surface volume ratio

$II.$ To minimize heat loss

$III.$ To maximize their surface volume ratio

$IV.$ To maximize heat loss

Choose the correct combination from the given option

The organism which tolerate wide range of salinity called …$A$…

$II.$ The organism which tolerate narrow range of salinity called …$B$…

Choose the correct option for $A$ and $B$