How Does Damming a River Destroy Wetlands

Multiple Choice

How does damming a river destroy wetlands?

A) Fish can no longer migrate up and down the river.
B) Wetlands can no longer obtain nutrients from annual floods.
C) Wetlands can no longer obtain oxygen from the flowing water of the river.
D) Birds can no longer get to the wetlands.
E) Increased nutrients flow into the wetlands causing eutrophication.