The sea anemone and the clown fish are an excellent example of which of the following?

Mycorrhizae are an example of

How do parasites harm the host?

In a humid climate,the presence of spines in shrubs is primarily:

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.

Given below are two statements:
Statement $I$: Competition can be defined as a process in which the fitness of one species is significantly lower in the presence of another species.
Statement $II$: According to Darwin,interspecific competition is a potent force in organic evolution.