Biological control methods adopted in agricultural pest control are an example of which interaction?

Amensalism represents which of the following interactions?

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 the 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:

Identify the positive interaction.

Two different species cannot coexist in the same niche for a long time. This rule is known as .......

Why does no predator become perfectly efficient at acquiring prey?