Which one among the following would most strengthen the claim that bats navigate by echolocation?

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Q: 34 (SCRA/2012)

Which one among the following would most strengthen the claim that bats navigate by echolocation?

question_subject: 

Science

question_exam: 

SCRA

stats: 

0,15,15,6,4,5,15

keywords: 

{'bats': [1, 0, 0, 5], 'echolocation': [0, 0, 0, 1], 'dark caves': [0, 0, 0, 1], 'evolution': [1, 0, 1, 0], 'species': [0, 0, 0, 2], 'prey': [2, 0, 0, 5], 'unique species': [0, 0, 0, 1], 'observer groups': [0, 0, 0, 1]}