The cells fill with water.
Saltwater eggs are given the name for a reason. They will live only in saltwater and will die right after you put them in fresh water.
Fresh water algae may struggle to survive in a saltwater environment due to differences in salinity levels. The saltwater will cause water to move out of the cells of the freshwater algae, causing them to shrink and potentially die.
it dies
All of the H2o will leave the cells causing it to shrivel up and die
They die because they can not live in saltwater, due to the salt.
it will die
Saltwater is a solution because you can get fresh water and some salt and mix it and then you get saltwater.
salt
Saltwater
If a jellyfish was placed in a freshwater lake, the jellyfish would be placed in a hypotonic environment. Osmosis says that water moves from areas of low solute concentration to high concentration, in order to reach a dynamic equilibrium. In other words, due to the fact that the jellyfish was placed in a hypotonic environment, or an area of low solute concentration compared to the jelly fish, its cells would be flooded with the fresh water and its cells would burst, causing the death of the jellyfish.
Rain water is fresh water and does not have salt. Saltwater is not fresh and does have salt.
Jellyfishes are evolved to live in saltwater, and their cells have mechanisms for absorbing water and excreting salts. However, in freshwater this ability works against them, causing them to swell up with water, and their cells burst.