Some snails can some can't, its as simple as that!
water snails but not regular snails
Snails can be found in various habitats, including freshwater and saltwater environments. In water, snails are commonly found in ponds, lakes, rivers, and streams. They can also be found in marshes and wetlands. Snails are adapted to living in water by having a shell that helps protect them and regulate their buoyancy.
I think what you are asking for is amphibian. An animal capable of living both on land and in water.
There are several species of water snails that have adapted to living entirely in water. They don't swim, but slither over the underwater stones and plants, rasping at the algae. Land snails and garden slugs will drown if placed underwater. Gardeners sometimes trap garden snails by putting out dishes of beer which attracts the snails - and the snails will drown in the beer.
Apple snails are comfortable in water temperatures of 65-82 degrees Fahrenheit
Snails are living and are considered to be biotic.
Every living creature needs oxygen to survive. Just as every living creature needs water to survive. For example, such as spiders. Yup, spiders do to need oxygen AND water to survive, and of course food. So the answer to your question would be yes, snails do need oxygen to survive.
Snails are mainly consumed of water.
No. Salt water snails have adapted to salt water and always will.
No. Salt water snails have adapted to salt water and always will.
Water snails have heavy shells that help keep them on the bottom.
The Biggest salt water snail is Syrinx aruanus, a marine species living in Australiawith shells reaching a meter in length.