Well, look at anthropology, this is the study of man. Then you have bio-chemistry which is the study of the chemistry of life. They both have to do with biology but they look at the different aspects. There are many different fields of biology that look into the study of organs, tissues, and even the structures and forms of organisms. Each one studies a specific region in the vast topic of biology. The answers we come up with in these individual topics come together to create a whole picture and explanation of what's around us.