Two different species cannot coexist in the same niche for a long time. This rule is known as .......

Amensalism represents which of the following interactions?

Predators also help in $A$ species diversity in a community,by $B$ the intensity of competition among competing prey species. Here $A$ and $B$ can be

There is more competition for survival between

Observe the set of $4$ figures $A$,$B$,$C$ and $D$ and answer the following questions:
$(i)$ Which one of the figures shows mutualism?
$(ii)$ What kind of association is shown in $D$?
$(iii)$ Name the organisms and the association in $C$.
$(iv)$ What role is the insect performing in $B$?

Small fish get stuck near the bottom of a shark and derive their nutrition from it. This kind of association is called as: