Final answer:
In the context of two groups coming together, the word 'unite' is used. While 'collaborated' can imply a sense of togetherness, it doesn't carry the exact meaning of unification. 'Separated' and 'diverged', however, denote moving apart.
Step-by-step explanation:
The word that shows the two groups came together from the given options is Unite. The term 'unite' specifically refers to the action of joining together or combining forces towards a common goal or cause. For example, in a sentence: 'The two tribes decided to unite to fight the common enemy.' Here, the word 'unite' clearly signifies the act of coming together.
Meanwhile, the words 'Collaborated', 'Separated', and 'Diverged' have different implications. 'Collaborated' usually means working together but does not always imply uniting as one. 'Separated' and 'Diverged' actually signify moving apart or becoming distinct rather than coming together.
Hence,the correct answer is option 4.unite
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