No.
Jellyfish can be multiplied by spanning or budding.
All jellyfish live in salt water and most do have venom in their tentacles.
No.
fresh water
possibly because brackish is a mixture of fresh and salt water and goldfish cant live in salt water so yeah most likely.
Please don't. goldfish are freshwater fish, not saltwater.
Goldfish don't need salt because they are Freshwater Fish!
They technically don't drink anything.They live in water.
I wouldn't think so as goldfish can't live in salt water.
No your goldfish did not "evolve" it "SURVIVED" being put in salt water. You don't say how much salt is/was in the water but placing a goldfish in water to which 1 teaspoon of salt has been added per gallon is a commonly used cure for fungus. Goldfish did not evolve they were selectively bred by Chinese aquarists from a species of wild Asian carp (Carassius gibelio) that had evolved over many millions of years.
Yes. Freshwater fish do not drink water, but instead absorb their water requirements through osmosis from their skin cells. Salt water has a lower concentration of water molecules than the water concentration inside the body of the goldfish, thus water moves via osmosis from areas of high concentration to areas of lower concentration. In this case, water would move from the goldfish's body to the salt water, resulting in dehydration of the goldfish, and eventually, death.