Snails have a distinct head with a pair of tentacles that can go in and out of its body. An eye is located at the base of each tentacle. Under the tentacles is the mouth. Inside the mouth there is a tongue that acts like a saw. It shreds the snails' food.
Snails eat mostly plants.
Sometimes they eat dead animals. Fish and some birds eat snails. Snails cannot live in water that has a low ph, because their shells will be dissolved. You will undoubtedly get eggs. Gastropoda Snails have been around for at least 500 million years, which dates them back to some of our oldest fossils.