$A$ kind of similarity found in polar regions and high altitudes is

What is diapause and what is its significance?

When an organism moves away temporarily from a stressful habitat to a more hospitable area and returns when the stressful period is over,what is this process called?

In desert grasslands,which type of animals are relatively more abundant?

Animals that move about or swim about in the sea 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.