Yes all bettas can mate with other bettas. " regular betta fish" there are different types and they can all breed together.
no because male betta's are really aggressive to other betta's which plakats are male's. but female betta's can stay with other females. don't try to, one of your betta's are going to end up dead.
Yes, but only one type of betta fish, which is the Plakat betta fish. Its not very common(rarely ever)but it is possible to turn out so. it could get short fins through being in a fight with another fish aswell but most people wouldn't like that
Np, but they will bite. Yes, they will fight to the death.
No female bettas have the long flowy finns commonly associated with the betta fish. Some males that are a specialty type (Plakat(sp?) types) have short short finns exactly like a female but they are fairly uncommon and well labelled usually due to their rareness. Usually when you get them from your local pet store, it says on the cup you got it from if its a boy or a girl. Otherwise, I am not sure.
yes
it looks like they have a big bubble in their side
She breeds with a male Betta Fish.
No. Betta fish will attack each other no matter the sex.
Your betta fish is a female if she has smaller fins than an average male.
Yes they will.
The Betta fish want to kill eachother. That's what all Betta fish want to do, that's a natural thing.
the female betta fish are released from a vent while a male embraces her