No, I don't think so. But they can have about two hundred offspring.
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The aquatic trapdoor snail is a livebearer. It needs two snails to reproduce, but it would be possible for them to be purchased pregnant then have babies on their own.
Most snails are hermaphrodites. This means that they are both male and female. All hermaphroditic snails can lay eggs. They can "mate" with themselves and thus only one can reproduce in an aquarium or pond. They also breed sexually as often as possible. Most snails lay eggs but some, like the trapdoor snail, give live birth. Trapdoor snails and a few other species of snails (apple, golden inca, four horned, etc.) are not hermaphrodites. They can only reproduce sexually.
Actually aquatic snails must breath out of water. They breath from the surface.
The trapdoor snail is not in every local fish shop so you will probably have to go online to find them reliably. These aquatic snails can be kept in both ponds and aquariums as a useful algae cleaner. To buy trapdoor snails see the links provided at the end of this page.
Japanese trapdoor snails give birth to live young.
Trapdoor snails do not get that big. The largest one I ever saw was an inch around, but the usual is a lot less. When they are hatched they are really tiny and you don't even know they are there for few day.
Yes, snails will overpopulate a pond if you let them. It will take a while, but they might. You can bye fish that eat snails, if you want them.
reproduce and do snail slime stuff
The male trapdoor snail buys the female snail flowers and then takes her to a dinner in a movie. If he is charming and funny and not too slimey, he will then proceed to mate with the female snail. These snails give birth to live young. They are not as prolific at breeding as egg laying aquatic snails.
Both, though mass asexual reproduction in snails is uncommon. Mainly because of the genetic disadvantages. An example of this is in the asexually reproduced offspring of the species Potamopyrgus antipodarum which have a higher rate of disorders and mutation. thus natural selection removes most of them.
Yes, some species of snails can reproduce with only one snail present.
african snails die by not eat a enough food.