why it is so much more common for males rather then females to have x linked disorders like color blindness or hemophilia

Because male chromosomes are XY, compared to females having two Xs (XX). If a female has an x-linked disorder to one of their Xs, the other X will be able to cover for that shortcoming. Males on the other hand do not have another X, thus, those disorders are expressed.

answer; ///(b) it is composed of four protein chains and four heme groups;

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.