Give scientific reasons: Clown fish and sea anemone pair up.

Match the following columns:

Column-$I$	Column-$II$
$P$. Calotropis	$I$. Special chemical
$Q$. Cactus and Acacia	$II$. Camouflage
$R$. Monarch butterfly	$III$. Thorns
$S$. Some species of insects and frogs	$IV$. Glycosides

What type of relationship is observed between insect-pollinated flowers and their pollinators?

In an intertidal area,when all starfish were removed,more than $Q$ species of invertebrates became extinct within a year due to $P$.

What kind of interrelationships exist between organisms in the biosphere?

Even a plant species,which makes its own food,cannot survive alone; it needs soil microbes to breakdown the $A$ matter in soil and return the $B$ nutrients for absorption. And then,how will the plant manage pollination without an animal agent? It is obvious that in nature,animals,plants and microbes cannot live in $C$ but interact in various ways to form a biological community. Choose the correct option for $A, B$ and $C$.