Yes.
Not at all! My parents didn't. Getting pregnant doesn't depend upon the blood types as far as I know.
No if both parents are o+ they must produce o+ offspring
yes
normally they have "o" plus or negative.
If both parents have genotype AO, it is possible to have a type O child, but this is very rare.
O plus.
yes
Two parents with blood type A+ can have an O+ baby. If they do so, the parents are certainly heterozygous for type A.
If both parents are O ,,,,,,,,,,,, all kids will be O ,, no possibility for A
Yes. O, Rh positive and B, Rh positive parents may produce an O, Rh positive child.
Yes, according to the site at the link below, a child can have A- blood, given parents of O+ and A+.
yes can