Although leaves of plants produce oxygen (O2) from CO2 during photosynthesis, their roots need to absorb O2 directly.
(leaves of plants; produce; oxygen (O2; T:during photosynthesis) (their roots; need; to absorb O2 directly) Context(their roots need,List([78, 94))):(their roots; need to absorb directly; O2)
their roots need,List([78, 94))
leaves of plants their roots their roots
produce need need to absorb directly
oxygen (O2 T:during photosynthesis
to absorb O2 directly
O2