What is a major problem caused by humans in the contamination and depletion of?

Blood made up of red and white blood cells work together to form

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?

What controls activities within a eukaryotic cell?