Predators play an important role in:

Study the four statements $(i-iv)$ given below and select the two correct ones out of them.
$(i)$ $A$ lion eating a deer and a sparrow feeding on grains are ecologically similar in being consumers.
$(ii)$ Predator star fish $Pisaster$ helps in maintaining species diversity of some invertebrates.
$(iii)$ Predators ultimately lead to the extinction of prey species.
$(iv)$ Production of chemicals such as nicotine,strychnine by the plants are metabolic disorders.
The two correct statements are

In which kind of population interaction, one species is harmed whereas the other is unaffected?

. . . . . . $A$ . . . . . . is a potent force in organic evolution. Identify the $A$.

Mycorrhiza is an example of which of the following?

$A$ relationship in which a sea anemone is attached to the shell of a hermit crab is called: