Reefs are sensitive to unusually warm waters caused by El Nino, a phenomenon thought to be connected to global warming .
(Reefs; are; sensitive to unusually warm waters) (unusually warm waters; caused; by El Nino) (a phenomenon thought; to be connected; ) (Reefs; are sensitive to; unusually warm waters)
Reefs unusually warm waters a phenomenon thought Reefs
are caused to be connected are sensitive to
sensitive to unusually warm waters
by El Nino
unusually warm waters