They don't. Most bivalves shells protect them from predators, but some become prey to the more intelligent or even more brute animals of the sea. The exception to this is the scallop, which can actually propel itself by opening and closing its shell with enough force to "fly" away from danger.
They proroduce thier to protect the eggs from predators
Rabits escape predators ( if they are lucky) by running or jumping and hopping away.
Only some species of octopus can shoot ink.
"slip"
they blend in
A hawk is a top predator, it does not need to escape predators.
by flying away
Yes ,some of them do .
They get a pardon from the pope.
By flying away.
They swim away.
Guff