Over a span of 50 years, civil engineers built wildlife
bridges to allow animals to safely cross highways that ran
through a forest. The first graph shows the change in the
number of wildlife bridges during those 50 years. The
second graph shows how a deer population in the same
area changed over the same period.
Number of wildlife bridges
Number of Wildlife
Bridges over 50 Years
Time
Deer population
Deer Population
over 50 Years
Time
