What are the fitness traits of flatworms for parasitism?

First, there is a large number of eggs being laid. The hepatic fluke can lay up to 10,000 eggs per day. This increases their chances of procreation. Secondly, the absence of many organ systems. So the bovine tapeworm lacks a digestive system. Thirdly, it is a special mucus that covers the body of the worms. It prevents them from being digested in the intestines and stomach. Well, the mucous membrane of eggs also protects unborn individuals from digestion.