Question

a research group has discovered that damselflies, a type of dragonfly, are being infected by a particular type of aquatic protozoan. both young and adult 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 the summer and early fall. which of the following conclusions is supported by the graph? a infection in embanked ponds increased during the sampling period. b protozoans reproduce more quickly in embanked ponds than creek - fed ponds. c protozoans were more common in creek - fed ponds than embanked ponds. d infection in creek - fed ponds remained constant throughout the sampling period.

Explanation:

Looking at the graph, the percentage of infected adult damselflies in embanked ponds is seen to increase over the sampling - period dates shown. There is no information in the graph about the reproduction rate of protozoans in different pond types (ruling out B), nor about the commonness of protozoans in different pond types (ruling out C). Also, the infection rate in creek - fed ponds is not constant (ruling out D).

Answer:

A. Infection in embanked ponds increased during the sampling period