Rhododendron is a characteristic plant of which region?

When organisms change their location to escape unfavourable harsh environment,it is called . . . . . . .

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

$A$: Shivering is an adaptation for low temperature.
$R$: Shivering warms up the body.

Identify the organism based on the following characteristics:
- It has the ability to concentrate its urine.
- It meets its water requirements from internal fat oxidation.
- It is found in the American desert.

Altitude sickness is an example of: