Assertion: marsupial | /r/HasProperty | characterized by pouch
Facets:
Source sentences:
text: In the opening line of the article, it says that marsupials are characterized by a pouch.
text: It is difficult to identify which fossils are marsupials, as they are characterized by aspects of the reproductive system that do not normally fossilize (such as pouches) and by subtle changes in the bone and tooth structure that show a metatherian is part of the marsupial crown group (the most exclusive group that contains all living marsupials).