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A snail brain has four hemispheres composed from Cerebral Ganglia. Studies show the brain is more simple compared to reptiles, mammals and birds, however it's capable of associative learning with roughly 20,000 neurons (compared to humans with 100 billion).
The snail has a nervous system with feelings and can see, sense vibrations, touch, eat, excrete, taste, smell, breathe, love, move, and has skin, mucous, muscle, eyes, kidney, lungs, mouth, teeth, foot, stomach, anus, heart, brain, memory, both a penis and a vagina, and generates saliva, has sweat pores, and touches things with two feelers. It carries its home as a hard light weight shell on its back and retreats into it at the sign of danger. It has no ears or conventional hearing like a human but is sensitive to sound waves picked up as vibrations.
It's agreed that a snail could be a passenger on a rocket trip into space, considering it could withstand the rigors of space travel and have its own environment, however communicating with it in English would be extremely challenging. The snail is a very different life form when compared to humans. Its brain does not have a speech center and it does not form sounds from its mouth as we know it. With comparative thinking, limited associative memory, words are not formed as we know it, but rather some basic and primitive actions are taken in terms of motion and movement.
Snails will respond to danger, food/taste, and sex. Some elements of training can be induced through their reactions and memory. They have schedules of day activity and periods of sleep. Their motions are very deliberate and slow within their own referential time frame. Developing a snail language and translating it to English is an unknown being studied at this time.