system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If salt is deadly to snails, how are there sea snails? Also, why is salt deadly to snails?

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gpt
In nature, things will always move from areas of high concentration to areas of low concentration. 

When this happens through a permeable membrane (skin which is not water-tight), we call this Osmosis. 

If the % of salt in a sea-snail's body is equal to the saltiness of the water it lives in, he will not lose moisture, but if we took him out of the sea and put him in a bucket of water which has extra salt dissolved in it, the sea snail would suffer the same fate as a land-snail covered in salt.