$A$ person moves from Delhi to Shimla during the hot summer days. This is an example of which of the following?

Consider the following four statements $(1-4)$ about certain desert animals such as kangaroo rat.
$(1)$ They have dark colour and high rate of reproduction and excrete solid urine.
$(2)$ They do not drink water,breathe at a slow rate to conserve water and have their body covered with thick hairs.
$(3)$ They feed on dry seeds and do not require drinking water.
$(4)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements for such animals are true?

Animals living in colder regions have shorter tails and ears compared to animals living in warmer regions. This phenomenon is called:

Alpine tundra is found in

$A$: Some organisms can maintain internal homeostasis by means of physiological processes and are called 'Regulators'.
$R$: 'Regulators' can maintain internal homeostasis only up to a limit of stressful conditions.

What percentage of organisms are conformers (in $\%$)?