I think saltwater. Ask a science pro
Most all sharks live in saltwater except the bull shark which can live in freshwater and saltwater.
Saltwater plants can. Freshwater plants usually can't. Most land plants can't either.
Most lakes contain freshwater. From this fact, I'm assuming it is made out of freshwater, rather than saltwater.
Not all sharks live in one type of water. Most of them live in saltwater but the bull shark can live in both saltwater and freshwater.
One of the most common fish that can live in both salt and fresh water is a salmon:)
The most common codfish is saltwater, but some are freshwater
Jellyfish live in mostly saltwater environments, although some live in freshwater. Most species of jellyfish usually stay near the ocean floor.
Flounders are saltwater fish, some can be kept temporarily in brackish water.
Frogs are primarily freshwater creatures. While some frog species can tolerate brackish water (a mix of freshwater and saltwater), most frogs live and breed in freshwater habitats such as ponds, lakes, streams, and marshes. They typically do not thrive in saltwater environments.
salt water
Most are natural freshwater, but some may be saltwater.
Dolphin's obtain water from their food, they don't actually need alot of fluid because unlike us, their skin is impermeable and they don't lose water by sweating.