Assertion: algae | /r/CapableOf | make oxygen
Facets:
Source sentences:
text: But that perception is wrong, because algae make oxygen, fish [they are a major source of food for aquatic organisms], oil, and many other useful materials," Graham told LiveScience.
text: Nearly all algae have photosynthetic machinery ultimately derived from cyanobacteria, and so produce oxygen as a by-product of photosynthesis, unlike other photosynthetic bacteria such as purple and green sulfur bacteria.