It is possible that for an immortal species to arise via biological evolution?
In biological evolution, living organisms continues to change. However, is there a point wherein evolution stops due to an organism not needing change anymore? This would be a state like that of perfection (completion of all necessary biological function in a species, making it sufficient to survive). For instance, in a highly advanced human being who had evolved into immortality. At this stage, the species is immune to degeneration and is in a continuous perfect state of good health. This does not mean freedom from death from external causes (e.g. injury).
In this state, a perfect environment is a given. For instance, a man-made ecological niche, engineered to be in perfect or continuous normal climate, ecological condition etc. To sustain immortal species).
At least, in this theory the closure of evolution could not prove to be long term unless perfect conditions remain to sustain immortal species as there still exists uncertainty (part of nature) due to genetic drift, wherein even beneficial genetic variation can become extinct.
Is there a possibility that such a perfect species in a perfect environment could evolve? Does nature allow such an evolution?