The pattern of organization that Melanie is using is cause-effect.
In the field of English linguistics, a cause-effect speech style is the one in which the cause of the occurrence of an event or problem is discussed.
After the cause has been discussed, the focus is made on elaborating on the problem that has been caused by it.
In the scenario above, Melanie first discusses about the pollution in the oceans which is the cause. Then she mentions how this pollution is affecting the orca whales which is the effect.
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