Which one of the following pairs shows co-evolution?

In which of the following can the best examples of mutualism be observed?

'Resource partitioning' is an important mechanism which promotes

Who proposed the Competitive Exclusion Principle?

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 $C$.

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