With the exception of the Nautilidae and the species of octopus of the suborder Cirrina, all known cephalopods have an ink sac, which can be used to push out a cloud of dark ink to confuse predators.
(all known cephalopods; have; an ink sac, which can be used to push out a cloud of dark ink) (an ink sac; can be used; to push out a cloud of dark ink)
all known cephalopods an ink sac
have can be used
an ink sac, which can be used to push out a cloud of dark ink
to push out a cloud of dark ink