2. A new recreation area is being built upstream from an estuary that is known for
its abundance of fish and turtles. A dam will be built across the river and a large lake
will form behind it. What effect will the dam have on the organisms living in the
estuary?
A Organisms adapted to living only in brackish water will survive.
B
Organisms adapted to living in brackish water will move to live in the open
ocean.
C Some of the organisms will die because the water will be less salty.
D Some of the organisms will die because the water will be more salty.