The job an organism does.
A Niche group is a group that shares the same interest.
"une niche" (fem.) is a doghouse in English.
A niche is an animals job in it's environment.
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Think of the term "niche" as "occupation" or "job". Thus every animal "functions" in its "niche". Different animals, domestic as well as wild, have different "niches" in which they best "function".
A niche is the role an organism has in the environment . for example some organism's niche is to hunt and kill certain animals and that balances the population within the ecosystem .
The term niche is used to define the role an organism plays within a community.
A niche is a particular place for things. Each person fills a particular niche in society and in their workplace. A niche can also be a shelf like opening in a wall or solid surface.
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Its niche....but that's circular....but I'm somewhat baffled as to why you didn't use the term "niche"....AnyWay...."function" is a group selectionist term that indicates the person asking the question hasnt the foggiest notion about evolution. So if your instructor used the term, have him or her fired. If its your own term usage, take note, its wrong. An organism has no "function" except to survive...and, if lucky, procreate.