Yes. Snails have gills, which makes them able to breathe underwater.
Aquatic and algae eating snails can through their gills; however, the type of snails you find in gardens can not, and if placed in water for to long will most likely drown.
Squids doesn't have lungs, they have a structure that does the same thing as the gills do for fish, take up oxygen from the water. W/o lungs, the idea of holding their breath becomes a bit strange. The closest comparison - how long a squid can go w/o new water over its gills - I have no idea.
Snails have gils.
Holding your breath underwater is when your head/face is underwater and you do not breath.
Hippos can't "breath" underwater but they can hold their breath for long periods of time.
Actually aquatic snails must breath out of water. They breath from the surface.
Seals can't breath underwater, so they have to come to the surface for air.
ocean/pond/river
You find Them under Water =]
To do the underwater challenge in Peru, YOU HOLD YOUR BREATH UNDERWATER DUMMIES
No. Human beings cannot breath underwater at all without an external source of air.
Pouch snails eat things under water such as algae and underwater plants.
they have gills.