The scientists wondered how zebra mussels might impact the Hudson River
ecosystem. What is one example of information that might help them
understand the zebra mussels' impact?
(A) the strength of the tides that come from the Atlantic Ocean after zebra
mussels arrive
(B the number of boats traveling on the river before and after zebra mussels
arrive
the amount of plankton in the river before and after zebra mussels arrive
the amount of time it takes for zebra mussels to travel to the Hudson River