Respuesta :
There is pollution in the East river that the Yellow Perch are adapted to but the Walleye are not.
Answer: Option D.
Explanation:
According to the information that has been given in the question, the Walleye has moved from the east river to some other river. Even though the prey that they have for food which is the yellow perch, then also they move from the east river to the other.
The probable reason for this is that the east river might be polluted. The yellow perch might have got adapted to this pollution and making this survival possible. But the walleye could not adapt to it.