The main point of divergence between these beings would be the fact that they are photosynthetic being autotrophic beings.
These beings from another planet would be able to synthesize their own food from inorganic material, thus being more evolved, as they would not need to develop methods of obtaining food, leaving more resources for technological and social development.
With this information, we can conclude that the main point of divergence between these beings would be the fact that they are photosynthetic being autotrophic beings.
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