The study of similarities and differences among structures of living organisms is called comparative anatomy

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

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

cells spend most of their time in interphase

i won't lie i don't know so go online and ask google thats what i do