Louse is an ectoparasite of

Epiphyte is an example of

Two closely related species competing for the same resources cannot coexist indefinitely. This principle is known as:

Organisms are dependent on each other because

In an association of two animal species,one is a termite which feeds on wood and the other is a protozoan $Trichonympha$ present in the gut of the termite. What type of association do they establish?

Given below are two statements.
Statement $I$: Intraspecific competition occurs between organisms of the same population.
Statement $II$: Such interaction may be beneficial,harmful or neutral to the interacting individuals.
In the light of the above two statements,choose the correct option.