Terry Erwin fogged 19 trees in the Amazon rainforest.Which statement about his study is true?

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The statement that is true is that Terry Erwin found a large number of beetle species, many of them undescribed. This is one of the main findings of his study, in which he fogged 19 trees in the Amazon rainforest and collected samples of the insects that fell from the branches. He estimated that there could be as many as 30 million insect species in the rainforest, based on his sampling methods. This is an important contribution to our understanding of biodiversity in the Amazon, and has been debated and discussed by scientists since the publication of his study in 1982.

Terry Erwin Fogged 19 Trees in the Amazon Rainforest