Question

According to the passage, the skeleton of a pterosaur can be distinguished from that of a bird by the select one: a. Anatomic origin of its wing strut b. Presence of hooklike projections on its hind feet c. Size of its wingspan d. Presence of hollow spaces in its bones e. Location of the shoulder joint joining the wing to its body

Answer 1

Pterosaurs were flying reptiles of the extinct order Pterosauria. They existed during most of the Mesozoic: from the late Triassic to the end of the Cretaceous (228 to 66 million years ago[. Pterosaurs are the earliest vertebrates known to have evolved powered flight. Their wings were formed by a membrane of skin, muscle, and other tissues stretching from the ankles to a dramatically lengthened fourth finger.