I think it is (b) i have studied this before. ( =
Subsets of {dog, cat, fish} are Ф, {dog}, {cat}, {fish}, {dog, cat}, {dog, fish}, {cat, fish}, {dog, cat, fish}.
Answer:
B
Explanation:
They would grow bigger and faster, meaning they would quickly outcompete the native salmon for food, space, etc.
I'm not entirely sure, but I think it is B) the pulley.
