In which of the following interactions are both organisms negatively affected?

Give one example for each of the following types:
$(a)$ Migratory animal
$(b)$ Camouflaged animal
$(c)$ Predator animal
$(d)$ Biological control agent
$(e)$ Phytophagous animal
$(f)$ Chemical defense agent

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 $C$.

In the early $1920$s,the prickly pear cactus introduced into Australia caused havoc by spreading rapidly into millions of hectares of rangeland. Finally,how was it controlled?

$A$ : 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.

Competition for light,nutrients,and space is most severe between: