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Fresh and salt water are very different for one key reason, fresh water doesn't contain salt and salt water obviously does. There are different flora and fauna in fresh and salt water for this reason.
yes because of the way their gills get oxygine from the water.
Salt water has salt water in it and is bad for you, fresh water has no salt water in it and is good for you.
The fresh water crab lives in fresh water, water without salt. Salt water crab has gills that process the salt away. And those stay in salt water places like hmm oceans
Fresh water contains no sign of salt, while on the other hand salt water contains salt
There are many different catfish species, salt water and fresh water.
saltwater has salt in it, freshwater does not.
Salt water contain dissolved sodium chloride; chemical and physical properties are different compared with fresh water.
No, only fish have gills.
There are fish that are commonly called "Bream" in both fresh and salt water.
Currents and thermal gradients aside, salt water is slightly more dense than fresh water, so (at the same depth, for the same temperature) the pressure in salt water will be creater than for fresh water. The difference in pressure will be (pressure in fresh water) x (density of salt water/density of fresh).
Are you serious? One is salty. The other is not.