A- valve replacement
b- stents
x- heart transplant
Answer is D.
you can learn A,B, and C from examining fossils
The Gutenberg Bible was the first major book printed using mass-produced movable metal type in Europe.
Hope this helps!
The odds are astronomical for a father with AB(IV) to have an O(I) child. The only possible way for this phenomenon to occur is if there was a nondisjunction in the ovogenesis for the 9th chromosome and the father also had a nondisjunction for the same chromosome(A sperm cell with no 9th chromosome fertilized an ovum with two 9 chromosomes).
A person with AB cannot donate to a person with O because the receiver has antibodies(alpha and beta) that bind to the antigens on the AB blood cells, causing death.
