books.google.co.uk - Nearly all living organisms are exploited by some sort of parasite. But what are parasites? How many different types are there? What exactly is parasitism? In this undergraduate textbook parasitism is described as an ecological relationship. Ecology implies the study of the interaction between organisms...http://books.google.co.uk/books/about/Parasitism_in_Perspective.html?id=Q6Kl0FbvStoC&utm_source=gb-gplus-shareParasitism in Perspective
