SC.912.N.1.2 Scientists have discovered that damselflies are being infected by a specific type of aquatic protozoan. Damselflies are not directly infected by the
protozoan, but contract the infection from the prey they eat. The graph shows the
percentage of adult damselflies infected by protozoans during summer and early fall.
Occurrence of Protozoan Infection
In Adult Damselflies
80
60
Percent Infected (%)
40
Embanked
ponds
Creek-led
ponds
20
0+
8/1
8/16 9/1 9/16 10/1 10/16
Date of Sample
Which of the following conclusions is supported by the graph?