The biome characterized by a layer of permafrost is known as:

The forests near the equator are known as .....

Read the following statements and select the option that represents the correct statements.
$(1)$ Kangaroo rats never drink water.
$(2)$ Birds undergo hibernation to escape adverse environmental conditions.
$(3)$ Thermal adaptation can be explained by Allen's Rule.
$(4)$ Opuntia possesses phylloclade for protection.

Which rule states that mammals living in colder climates generally have shorter ears and limbs to minimize heat loss?

Altitude sickness is an example of:

Which organism does not drink water but uses water produced as a byproduct of its internal metabolic processes?