The reading passage explains about how the zebra mussel population dominates other fresh water aquatic fishes and also how inexorable the mussel species. However, the lecturer refutes this and he uses other information and he says that the mussels can easily be controlled and the passage is exaggerating about the mussel. According to the professor the mussels were wouldn’t controlled because of lack of proper knowledge to deal with them. But now that’s not the case anymore. He explains that how zebra mussel population can be desisted across the European canal. The passage says that human transportation like ships are primary sources of invasion of mussels in the North American waters. As the ship uses Ballast water to balance the ship, the