If you are keeping pet snails that have similar markings and cannot tell them apart, use different coloured paints (not water-based) or nail varnish to put a small dot of colour on the shell to help with identification.
If the question meant "how do you tell male and female snails apart?", then the answer is that there are no male or female snails. Snails are hermaphrodites (have characteristics of both sexes) and so any two snails can reproduce.
Apart from having shells, snails are basically the same animal as slugs.
No. A snail's shell is apart of its body.
See differences at applesnail.net -> anatomy -> reproductive system section.
Snails don't give birth. They lay eggs.
The answer depends on what you want tell it apart from!
Tried snails in China but they put that much spice into it I couldn't tell what the taste of the snail was like.
it depends what you are telling apart
Lift up it's skirt.
yes, I am a snail and I can tell you that roses are the worst!
You can't. They are all the same gender.
Meerkats tell each other apart with smell and dominant
Depends what "them" is