This is a simple accessor function for streamlining access to values/vectors/factors/etc contained in the sample_data.
(Required). Character string of the variable name in
Data. The clas of the data depends on what the contents of sample_data.
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 Soil Soil Soil Feces  Feces Skin Skin Skin  Tongue Tongue Freshwater Freshwater  Freshwater (creek) Freshwater (creek) Freshwater (creek) Ocean  Ocean Ocean Sediment (estuary) Sediment (estuary)  Sediment (estuary) Feces Feces Mock  Mock Mock 9 Levels: Feces Freshwater Freshwater (creek) Mock ... Tongue
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