Why do animal cell burst in pure water

Answer

The water makes the cell expand

Explanation:

When we put animal cells into pure, fresh water (H2O) , water enters the cells as a result of osmosis, and making the cell expand. ... Since animal cells do not have a cell wall, when too much of this water enters to make the concentration of water on both sides even, the animal cell may eventually burst, and die out

yes, because even though a theory has a  lot of evidence to support it, it is not always true