What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?

A hypotonic solution has a lower solute concentration than the inside of the organism, so water moves into the cell by osmosis. As water enters, the cell swells; without enough protection or a way to remove the excess water, it can burst. Therefore, the most likely outcome is that it would swell and then burst.

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