1A) Yes (unless there's an exception that I'm unaware of)

1B) No (see above)

2) No

3) Yes, but only because there are one or more fin types and one or more body types that can't be bred. You have to consider each "component" separately.

3B) Not if you get lucky!

4) Yes (except the one(s) that only come from eggs)

4B) N/A

5A) Yes

5B) No

Consider yourself humored! If you do find any exceptions to 1A, I'd love to hear about them.