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To develop a method for measuring snow depth with laser beams, NASA physicist Yongxiang Hu relied on ________; identifying broad similarities between two seemingly different phenomena, Hu used information about how ants move inside colonies to calculate how the particles of light that make up laser beams travel through snow.

Which choice completes the text with the most logical and precise word or phrase?
Difficulty: Medium

a collaboration


an accessory


a contradiction


an analogy

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