Which one of the following is most appropriately defined?

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 $C$.

Define the following terms and give one example for each:
$(a)$ Commensalism
$(b)$ Parasitism
$(c)$ Camouflage
$(d)$ Mutualism
$(e)$ Interspecific competition

If the strong partner is benefitted and the weak partner is damaged,it is known as

What are the organisms that feed on plant sap and other plant parts called?

Louse is an ectoparasite of