Blood types have nothing to do with marriage. However if you are Rh + and she is Rh - you might need medical help if you plan to have babies together.
Yes
of course she can
Yes, absolutely - an O positive woman and an O positive man can have a healthy baby.
An O positive girl may marry an AB positive man. There are no blood-type related restrictions on marriage.
Yes, they can get married.
The blood type of any children would depend on the zygosity in the woman. (Both O and Rh negative are recessive, and will be homozygous in the man). If the woman is homozygous B, then the children will B. If the woman is heterozygous B, either O or B (with 50% chance of each). In the same way, if the woman is homozygous Rh positive, then the children will also be positive. If the woman is heterozygous, then children will be either positive or negative. In short, the possibilities for child blood types are either B or O, with Rh positive or negative.
the child has o negative blood
why not...
Yes, all blood types can have children together.
Yes, provided both man and woman has heterozygous genes for Rh.
no way.
Yes. My mother is O positive and my father is O negative and I am O negative