If an animal cell is left in an unknown solution overnight, and the next day the cell bursts, it can be assumed that the unknown solution is:

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When animal cells are left in a hypotonic solution overnight, they will lyse (burst). This is because in a hypotonic solution there is a greater concentration of solute inside of the cell than outside of the cell. Through osmosis, water enters the cell to equalize the difference in concentration, causing it to burst.
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If an Animal Cell Is Left in an Unknown Solution