$A$ relationship in which a sea anemone is attached to the shell of a hermit crab is called:

Commensalism is the interaction in which

American lakes visiting flamingoes and resident fishes compete for their common food $A$ in the lake. Resources $B$ limiting for competition to occur; in interference competition,the feeding efficiency of one species might be $C$ due to the interfering and inhibitory presence of the other species,even if resources (food and space) are abundant. Choose the correct option for $A$,$B$,and $C$.

Match List $I$ with List $II$ :

List $I$ (Interaction)	List $II$ (Species $A$ and $B$)
$A$. Mutualism	$I$. $+(A), 0(B)$
$B$. Commensalism	$II$. $-(A), 0(B)$
$C$. Amensalism	$III$. $+(A), -(B)$
$D$. Parasitism	$IV$. $+(A), +(B)$

Choose the correct answer from the options given below:

$A$: An ecological niche is usually occupied by a single species.
$R$: More than one species can live in the same habitat.

Organisms are dependent on each other because