No fish is best for a bowl, buy at-least a one gallon tank with filter, and you will clean it once every 2 to 4 weeks, a bowl will have to be cleaned every week. Also, your fish can swim better with more room, become less bored, and will be happier. If this is above your budget, fish is not for you.
Not a lot. I guess if you had a TINY fish that would work. But the rule is 1 inch of fish per gallon. =)
No fish should be kept in a bowl or tank less than 1 gallon, especially one without a filter or heater.
A Goldfish bowl :)
Betta
I would say gallons. Depends what kind of fish, but smaller than 10 gallons seems cruel.
The best candidates are Betta fish and Paradise Gouramis
That depends on the size of the fish bowl.
None, else, have 10 Foot shark :-)
Goldfish
A fish in a bowl
Gallon.Gallon.Gallon.Gallon.
depends on what kind of fish
A beta fish lives happily in a bowl. Never, ever put a goldfish in a goldfish bowl (ironic, I know) because it's too small for them to live in.
If you want a fish bowl fish I recommend a betta fish but, none do.
Well usually every 3-4 days is best