Answer:
the transformation of their group from a dyad to a triad
Explanation:
In the scenario presented in the context, the relationship between Rebecca and Farah changed as Farah included her new friend, Alison to the group and did all the things or activities which Rebecca and Farah used to do together earlier.
The dyad group of Rebecca and Farah changed to triad when Alison was included in the group which affect the relationship between both the friends Rebecca and Farah.
the answer is Air and Water pollution.
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