Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called

Given below are two statements:

Statement $I:$ Gause's 'Competitive Exclusion Principle' states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.

Statement $II:$ In general, carnivores are more adversely affected by competition than herbivores.

In the light of the above statements, choose the correct answer from the options given below:

Which one of the following is categorised as aparasite in true sense?

Animals eating plants are categorised separately as ...$A$..., they are in a broad ecological context, not very different from ...$B$...

Choose the correct option $A$ and $B$

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