Which of the following is an example of predation?

Even a plant species,which makes its own food,cannot survive alone; it needs soil microbes to breakdown the $A$ matter in soil and return the $B$ nutrients for absorption. And then,how will the plant manage pollination without an animal agent? It is obvious that in nature,animals,plants and microbes cannot live in $C$ but interact in various ways to form a biological community. Choose the correct option for $A, B$ and $C$.

Herbivores,which are an integral part of the ecosystem's food chain,can be ecologically considered as:

Which one of the following pairs shows co-evolution?

In commensalism,

$A$ high density of elephant population in an area can result in