Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together,they may avoid competition in the same garden by:

$A$ : 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.

Resource partitioning includes

The orchid $Ophrys$ employs 'sexual deceit' to get pollinated by a species of bee. One petal of its flower bears an uncanny resemblance to the female of the bee in size,colour,and markings. The male bee perceives it as the female and attempts to copulate with the flower. During this process,pollen grains are dusted on the male bee's body. What is this phenomenon called?

Match the columns:

Column-$I$	Column-$II$
$(a)$ Predation	$(i)$ Cuscuta and hedge plant
$(b)$ Commensalism	$(ii)$ Balanus and Chathamalus
$(c)$ Parasitism	$(iii)$ Cactus and Moth
$(d)$ Competition	$(iv)$ Orchid and Mango

Two closely related species competing for the same resources cannot coexist indefinitely. This principle is known as: