Oak trees also produce tannin and phenol when attacked by caterpillars and they release ethylene gas to alert oak trees downwind to produce these chemicals.
(Oak trees; also produce; tannin and phenol; T:when attacked by caterpillars) (they; release; ethylene gas) Context(they release,List([75, 87))):(they; release ethylene gas to alert downwind; to produce these chemicals) Context(they release to alert downwind,List([75, 128))):(they; release ethylene gas to alert downwind to produce; these chemicals)
they release,List([75, 87)) they release to alert downwind,List([75, 128))
Oak trees they they they
also produce release release ethylene gas to alert downwind release ethylene gas to alert downwind to produce
tannin and phenol T:when attacked by caterpillars
ethylene gas
to produce these chemicals
these chemicals