$A$ sedentary sea anemone gets attached to the shell lining of a hermit crab. The association is:

$A$ : The interaction between sea anemone and clown fish is commensalism.
$R$ : The fish gets protection from predators but anemone does not appear to derive any benefit.

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

Select the correct match.

$(I)$ Interaction	$(II)$ Effect
$(a) (+, -)$	$(P)$ Amensalism
$(b) (-, -)$	$(Q)$ Commensalism
$(c) (-, 0)$	$(R)$ Predation
$(d) (+, 0)$	$(S)$ Competition

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

What does the following figure represent?