Although plants produce oxygen from carbon dioxide during photosynthesis, their roots need to absorb oxygen directly.
(plants; produce; oxygen; T:during photosynthesis) (their roots; need; to absorb oxygen directly) Context(their roots need,List([74, 90))):(their roots; need to absorb directly; oxygen)
their roots need,List([74, 90))
plants their roots their roots
produce need need to absorb directly
oxygen T:during photosynthesis
to absorb oxygen directly
oxygen