Assertion: gastropod's system | /r/CapableOf | evolve to oxygenate endosymbiont
Facets:
value: most likely
type: DEGREE
value: in an oxygen-poor environment
type: LOCATION
Source sentences:
text: The elaborate cardiovascular system most likely evolved to oxygenate the endosymbionts in an oxygen-poor environment, and/or to supply hydrogen sulfide to the endosymbionts.