How many number of pairs are correct?
$(1)$ Aves - eurythermal
$(2)$ Mammals - stenothermal
$(3)$ Amphibia - stenothermal
$(4)$ Reptile - eurythermal
$0$
$2$
$3$
$4$
Species that can tolerate wide range of salinity are called $ .............$ .
Ravi, who lived at sea level, had around $5$ million $RBC$ per cubic millimeter of his blood. Later when he lived at an altitude of $18,000 ft$, showed around $8$ million $RBC$ per cubic millimeter of blood. This is an adaptation because
Factors which play significant role in the formation of major biomes are
Plants grow sparsely in arid regions of the world
Eurythermals are the organism which