Question

Passage

For decades, evolutionary biologists debated whether flight or echolocation developed first in the evolutionary history of bats (Chiroptera). The discovery of *Onychonycteris finneyi*, a primitive fossil bat dating back fifty-two million years, provided key insights. The fossil possesses well-developed wings and a skeletal structure indicative of strong flight capabilities, yet its cochlea is small and lacks the specialized features seen in modern echolocating bats. Researchers argue that flight preceded the ability to echolocate, suggesting that ancestral bats first evolved as aerial insectivores relying on vision and olfaction. Opponents of this flight-first hypothesis claim that the fossil’s skull structure is too damaged to definitively rule out proto-echolocation, arguing instead that both traits must have evolved concurrently due to the high metabolic cost of flight without sensory tracking. However, micro-CT scans of the fossil's basicranium reveal no expansion of the auditory chambers, supporting the assertion that *Onychonycteris* could not process high-frequency signals. Consequently, the prevailing consensus suggests that flight served as the evolutionary precursor to echolocation, allowing these mammals to first inhabit the night skies before refining their sensory apparatus.

Question

Read the passage above, then match each claim made by the researchers or their opponents on the left with the specific evidence or reasoning used in the text to support that claim on the right.