No they can't.
Do not, no matter what put a goldfish and a betta together unless you want the goldfish to die!!!
You should not put a male betta with goldfish's.They are aggressive and will fight with goldfish's goldfish give off ammonia and will kill the Betta's.
No.
Betta fish are best as a solitary fish and are not compatible with goldfish.
No. They are entirely different species. Goldfish are a coldwater species of carp "Carassius auratus" and the Betta or Siamese fighter is a tropical anabantid "Betta splendens".
no.
goldfish. Definatly goldfish. Or betta
If they are not too old and the female is ready, then they will mate.
It depends, if the goldfish are all males (or females) no, but if not of course they can mate.
They are Both fish
NO
Betta's or Goldfish.