True about niches? i. new species can outcompete native species to fill a niche. ii. extinction or emigration of a species can leave a niche vacant. iii. a particular niche within an ecosystem can usually be filled by only one species.

 I. New species can outcompete native species to fill a niche.


Niche is like a profession because everybody in our world performs a different job. Niche is somewhat defines like what you do, how you do it, where you do it and when you do it.In ecology, a niche is a term about the relational position of every species like dolphin. In where dolphin can potentially be in another ecological niche by travelling from one place to another. Profession are something like finding your specialty, your place and your niche in the world.