They may try to get some oxygen XD
Yes. goldfish breathe water so if a goldfish is out of water it cant breathe so it will suffocate
You can use clean tap water for your goldfish, but not dirty or used water.
Yes, actually it must be in water. If the goldfish is not in water, it will die due to suffocation.
No they do not. The water lice are parasites and will drink the blood of the goldfish.
Don't take a goldfish out of water.
If the goldfish is swimming in water, it is alive.
What else would you expect them to swim in? Of course Goldfish swim in water.
Goldfish are meant to live in cold water, not the warm water in a tropical aquarium. This is a huge reason why goldfish and tropicals shouldn't be in the same tank.
It may be that the oxygen content of the water is low, this can occur especically on hot days. Change the water or try adding some water plants.
Cold water.
to cool them down
Unchlorinated water, such as bottled distilled water is best.