When one organism is benefitted without affecting the others is called

In an aqueous environment, the microscopic animals are collectively 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:

Match the columns :

Name the association in which one species produces poisonous substance or a  change in environmental conditions that is harmful to another species.