There are some categories between the ants: workers and soldiers, the soldiers attack the strangers, the workers make a bridge with their bodies to cross rivers and other dangers
Sometimes.
to proctect rib
they proctect the body if is danger
By grounding electrical energy.
Sponges protect themselves with spikes in their body.
with its sharp needle like fangs
proctect yourself
It causes healing to begin at the injury site.
Cats have claws and teeth to protect themselves from predators.
cells are cells that are proctect but cancer can put them in danger
By living in colonies they are protected in numbers. If their colony is attacked they 'swarm' the attacker and can bite. Red ants are more protected as their red body acts as a warning to predators and they can bite.
I only know about Leaf-cutter ants. They find leaves, let them rot, then eat the mold.