In bacteria,fungi,and lower plants,various kinds of thick-walled spores are formed which help them to survive unfavourable conditions. This phenomenon can be called ...........

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

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.

Many freshwater animals cannot live for long in sea water and vice-versa mainly because of the

$A$ physical place or set of environmental conditions around the organism to which it must adapt to survive and prosper is . . . . . . .

Savannahs are: