Question: Reshape the `mortality` data frame into a long format so that there are only three columns - country, year, and mortality_rate. Name this new dataframe

Reshape the `mortality` data frame into a long format so that there are only three columns - "country", "year", and "mortality_rate". Name this new dataframe `long_mortality`. You may want to look into the function `reshape2::melt()`. Ensure the "year" column is numeric. In R studio

I am trying to reshape a wide data frame into a long data frame but the code won't recognize the column variable names.

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