Could a marine plant have a salt-filtration system for when plants suck up the sea-water (providing a source of fresh water?)?
In a world I want to make, sailors would travel at sea for many years, perhaps up to ten, on sail boats. Obviously, they'd normally be stricken by scurvy and such, but I was thinking of some kind of "super food" that could sustain them, even if just barely. I imagined a marine plant that could suck up plentiful water, but filter out the salt and other impurities. This plant would have all the things the sailors could not fish for, especially vitamin C to prevent scurvy. And, on top of that, the plant would have a good deal of water within, so that they'd continually have a source of fresh water. Is this possible in any way? Or is this a stupid "plot convenience" concept? Thanks.
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