the pterosaurs capable of powered flight

The reading and the listening are about the ability of pterosaurs to fly. While, the author feels that pterosaurs were not capable of powered flight, the lecturer challenges the claims made by the reading and states the pterosaurs may have the ability for a powered flight. First, the reading mentions that pterosaurs were cold-blooded animals, so their metabolism was not able to supply them with a sufficient amount of energy. On the other hand, the lecturer opposes this and says that the examined pterosaurs' fossils revealed that they had dense hair covering similar to fur. The professor adds that it is typical to warmed-blooded animals to maintain their body temperature when there was an extra condition of cold weather. A s a result; the listening posits that pterosaurs' metabolism could be faster than the reading suggested, so it could supply pterosaurs with enough energy to fly. Second, the writer states that pterosaurs were very large and heavy to flap their wings and fly. On the contrary, the professor contradicts this and points out that pterosaurs had a specific anatomical feature; their bones were hollow instead of solid. The lecturer adds that despite their large body frame, their weights were low. The listening explains that the pterosaurs' weight was low enough to keep them fly and glide. Third, the reading says that the pterosaurs' legs were too small and weak to allow them to fly. Conversely, the professor refutes this and mentions that pterosaurs were different than birds. The lecturer states that birds use their hind two legs to run and fly; nevertheless, pterosaurs used all their four limbs to run fast and jump high to launch themselves into the air. Furthermore, the speaker says that there was no problem for very large pterosaurs to use their four limbs to run fast and launch high enough into the air.