What are three possible long-term consequences of two species occupying the same niche?

On the basis of the competitive exclusion principle, the two species cannot thrive in a similar niche for a prolonged time period and coexist stably. This is due to the fact that the species with identical niches seem to exhibit similar requirements, thus, the competition of similar resources.  

As a consequence, of the two species one can occupy and adapt the same niche, can get eliminated and die, or may drift to a less competitive region. One of the species may end up in becoming more efficacious than the other. And on certain occasions, when the struggle is not that tough then one of the species may get develop to possess somewhat distinct niche.  

the transfer of energy between two molecules spaced just nanometers apart plays a key role in many technologies, including photovoltaics, quantum information systems, lighting, and sensors, as well as in biophysics to measure nanometer distances and in photosynthesis. but an open question in this area is what effect, if any, the surrounding photonic environment has on this nanoscale energy transfer. by designing and performing a carefully controlled experiment to answer this question, scientists have settled the debate and found clues to improving the efficiency of many of the technologies that rely on this process.

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