While researching a topic, a student has taken the following notes:

• Pterosaurs were flying reptiles that existed millions of years ago.
• In a 2021 study, Anusuya Chinsamy-Turan analyzed fragments of pterosaur jawbones located in the Sahara Desert.
• She was initially unsure if the bones belonged to juvenile or adult pterosaurs.
• She used advanced microscope techniques to determine that the bones had few growth lines relative to the bones of fully grown pterosaurs.
• She concluded that the bones belonged to juveniles.