How are frog bones similar to trees?

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?

In the water cycle , when does water undergo a chemical change

What are the 3 types of artificial cloning