Some animals can change their body temperature according to the ambient temperature,then they are simply . . . . . . .

How can seals survive in a polar climate where the temperature prevails below $0^{\circ} C$?

$I.$ Many xerophytic plants have thick cuticle on leaf epidermis and sunken stomata.
$II.$ Some xerophytic plants have a special photosynthetic pathway $(CAM)$ that enables their stomata to close during the day.
$III.$ $Opuntia$ has spines (modified leaves) and a photosynthetic phylloclade (stem).
$IV.$ All adaptations are genetically fixed in all organisms.
Choose the combination of correct statements.

Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer,thousands of migratory birds from Siberia and other extremely cold northern regions move to:

To which habitat is the elephant adapted?

Which one of the following is the correct matching of a plant, its habit, and the forest type where it normally occurs?