What adaption is used by polar bears to maintian homeostasis in cold temperature

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?

When water freezes, it . contracts expands

What causes the phospholipids to organize themselves the way they do