Can o negative blood boy pregnant o positive girl
NO,
Yes.
you can marry anyone you want
no
yes
no
yes, he can. If boy blood group A positive or any other such as B or O positive and girl have A, B, or O, or AB negative then can be danger for offspring. If she already have positive blood group, there is no danger.
Marriage is a purely man-made celebration. Blood type does not matter.
Sure. In most states in the US, blood types aren't even a question.
see a doctor for such questions
yes
yes