One. It is not a theory, except in some benighted sociological sense.

Two. Darwin did not develop this concept, Herbert Spencer did, and it is very poor evolutionary theory; somewhat group selectionist and somewhat Lamarckian om nature.

Three. So your question is not even answerable except in the negative and in conformation to the two points above.

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.

Hyper-selectionism, in the philosophy of biology, refers to people who attribute all (or nearly all) evolutionary change to natural selection, and ignore, disregard or minimize the significance of so-called "random" sorting mechanisms such as genetic drift.

The term is usually applied as a criticism of someone else's work. Nobody refers to themselves as a hyper-selectionist.

It's not a disease, so I think you might have asked in the wrong forum.

Hyper-selectionism, in the philosophy of Biology, refers to people who attribute all (or nearly all) evolutionary change to natural selection, and ignore, disregard or minimize the significance of so-called "random" sorting mechanisms such as genetic drift.

The term is usually applied as a criticism of someone else's work. Nobody refers to themselves as a hyper-selectionist.

It's not a disease, so I think you might have asked in the wrong forum.

Hyper-selectionism, in the philosophy of Biology, refers to people who attribute all (or nearly all) evolutionary change to natural selection, and ignore, disregard or minimize the significance of so-called "random" sorting mechanisms such as genetic drift.

The term is usually applied as a criticism of someone else's work. Nobody refers to themselves as a hyper-selectionist.

It's not a disease, so I think you might have asked in the wrong forum.