Can someone answer this for me?

Prior to the development of dna fingerprinting, blood type could be used to determine possible parentage. although it might prove someone was not a parent, it could not show if someone was positively the parent, only that he or she might be a parent. which of the following is a true statement that can be made about parentage based on blood typing?

Why does the skin of your finger shrink when you wash clothes for a long time?

If a checkpoint detects damaged dna, the checkpoint may