Assertion: ostrich's system | /r/HasProperty | known to mankind
Facets:
Source sentences:
text: When fully grown, an ostrich has one of the most advanced immune systems known to mankind.
text: When fully grown, an ostrich has one of the most advanced immune systems known to mankind.
text: When fully grown an ostrich has one of the most advanced immune systems known to mankind.
text: They also have the best feed-to-weight ratio and the most advanced immune systems known to mankind.
text: An adult ostrich has the most advanced immune system known to mankind