Coral reefs less healthy now

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"Coral Reefs Less Healthy Now Than 2 Years Ago" warns that "Only about 30% of the world's coral reefs are healthy, down from 41% 2 years ago, according to a study released yesterday [in 2004] that lists global warming as the top threat."37 Tell what the two categorical variables of interest are, what possible values they can take, and which is explanatory and which is response.

Reference no: EM131816828

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