Which of the following can work against the downslope pull of gravity

Could someone me with number one you

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?

Organisms that successfully adapt will leave to grownone of the above