Assertion: immune system | /r/HasProperty | ancient
Facets:
value: extremely
type: DEGREE
Source sentences:
text: The immune system is extremely ancient, and may go back to single-celled eukaryotes which needed to distinguish between what was food and what was part of themselves.
text: The immune system is extremely ancient, and may go back to single-celled eukaryotes which needed to distinguish between what was food and what was part of themselves.