The lecture described three reasons to prove Pterosaurs were capable of powered flight, which opposed the theory in the reading passage.
Firstly, the reading passage indicated Pterosaurs were probably cold-blooded because powered flight required the energy to fly that fly are warm-blooded. But the lecture disproved the theory because Pterosaurs had fur on their body that kept them warm in cold condition which proved they were warm-blooded.
Secondly, the reading passage said Pterosaurs were so heavy that can't be kept airborne by powered flight. But the researchers found out Pterosaurs' bone were hallow that caused they don't have huge weight even they had big size.
The last reason proved Pterosaurs were powered flight because they used four legs to walk and jump instead used two back legs like birds. So their four legs could allowed them to launched themselves in the air and fly.
Hence, the lecture proved Pterosaurs were capably of powered flight.