【单选题】The fossil remains of the first flying vertebrates, the pterosaurs, have intrigued paleontologists for more than two centuries. How such large creatures, which weighed in some cases as much as a pilot...
A.
enormous wingspan of the pterosaurs enabled them to fly great distances
B.
structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats
C.
fossil remains of the pterosaurs reveal how they solved the problem of powered flight