When organisms change their location to escape unfavourable harsh environment,it is called . . . . . . .

In a sea shore,the benthic animals live in sandy,muddy and rocky substrata and accordingly developed the following adaptations:
$(a)$ Burrowing
$(b)$ Building tubes
$(c)$ Holdfasts / peduncle
Match the suitable substratum against each adaptation.

The following is a graphical representation of organismic response. Identify $P, Q$,and $R$.
$P \quad\quad Q \quad\quad R$

Which of the following are the dominant plants of the cold desert?

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

The organism which tolerates a wide range of salinity is called ...$A$...
$II.$ The organism which tolerates a narrow range of salinity is called ...$B$...
Choose the correct option for $A$ and $B$.