What is the function of predation?

Amensalism represents which of the following interactions?

Statement $-I:$ The interaction where one species is benefitted and the other is neither benefitted nor harmed is called commensalism.
Statement $-II:$ Barnacles growing on the back of a whale is an example of commensalism.

Definition / Explanation: Ectoparasites

Choose the correct statements regarding population interactions between two species.
$A$. In both parasitism and commensalism, only one species benefits and the other species is harmed.
$B$. Both species benefit in mutualism.
$C$. Both species benefit in commensalism.
$D$. In parasitism, only one species benefits and the other species is harmed.
$E$. In amensalism, one species is harmed and the other is unaffected.

In an aquarium,two herbivorous species of fish are living together and feeding on phytoplanktons. As per the Gause's Principle,one of the species is to be eliminated in due course of time,but both are surviving well in the aquarium. Give possible reasons.