Answer:
E). All are troublesome exotic species in the U.S.
Explanation:
The commonality that exists between Zebra mussels, Gypsy moths, Asian carp, and water hyacinths is that 'they all are troublesome exotic species in the United States.' The invasive or troublesome species are characterized as the species of an organism that is not native or indigenous to a specific area and may cause harm to the ecosystem of the new area. Thus, the similarity between all these living organisms is that they are non-native and hence, may harm the United States' ecosystem. Hence, option E is the correct answer.
