Complete the sentence about Frankincense with the correct year: In a ______ study, an ecologist at Wageningen University & Research claimed that, by the late-1990s, Boswellia papyrifera trees in Eritrea were becoming hard to find.

Answer and explanation

Correct answer: C. 2006

  1. Step 1: In a 2006 study, an ecologist at Wageningen University & Research claimed that, by the late-1990s, Boswellia papyrifera trees in Eritrea were becoming hard to find. Answer: 2006. Why not the others: 2001, 2021 and 2009 don't fit.

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