Why do mammals of colder regions generally have shorter ears and limbs?
$I.$ To minimize their surface area to volume ratio
$II.$ To minimize heat loss
$III.$ To maximize their surface area to volume ratio
$IV.$ To maximize heat loss
Choose the correct combination from the given options:

Do you agree that regional and local variations exist within each biome? Substantiate your answer with suitable examples.

Animals having a built-in thermostat to maintain constant body temperature are known as

Consider the following four statements $(1-4)$ and select the correct pair of adaptations shown by desert lizards to manage their body temperature in their environment.
$(1)$ Burrowing into the soil to escape high temperatures.
$(2)$ Losing energy rapidly from the body during high temperatures.
$(3)$ Basking in the sun when the temperature is low.
$(4)$ Covering the body with a thick,fatty skin.

The organisms spending most of the time in the transitional area between two communities are called:

Distinguish between the following:
$(a)$ Hibernation and Aestivation
$(b)$ Ectotherms and Endotherms