it is very important for couples intending to marry to have series of test to be done on them.Why-because people with certain blood group can not marry each other.for example people who are ss can not marry the same group of people because thier children are also going to possess the same group of blood and thier is every tendancy they will not survive b4 they get to thier 21st yr of life.it will bring a lot of pain to the parent becos a lot of money,time,resources,energy and so no will be lossed.people wit rhesus negative especially the women should be very careful when choosing a life partner becos it could endanger the life of the growing child in the womb and even the subsequent pregnancy
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