Paleontologists think that Unenlagia, Anhanguera, and other long-extinct theropods and pterosaurs may have breathed using air sacs connected to tubelike extensions inside the animals’ bones. Such structures are found in modern birds, which is why some paleontologists treat the respiratory systems of birds as those of Unenlagia, Anhanguera, and other theropods and pterosaurs.
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Verbal·Craft and Structure·Words in Context
mediumWhich choice completes the text with the most logical and precise word or phrase?
A
harbingers of
B
emissaries for
C
proxies for
D
subordinates of