The two factors most likely to affect whether a galaxy will evolve by merging with a second galaxy are:
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Its size compared to that of the other galaxy - The gravitational influence and dynamics of the galaxies' sizes play a critical role in their potential to merge. Larger galaxies have a greater gravitational pull, which can influence interactions with smaller galaxies.
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Its distance from the other galaxy - The proximity of galaxies to one another is crucial for determining whether they will interact or merge. A smaller distance increases the likelihood of gravitational attraction leading to a merger.
While the age of a galaxy and its gas content might influence effects after a merger, they are not primary factors affecting the likelihood of a merger occurring.
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