Planaria are flatworms that are found in shallow streams, often attached to the bottoms of
rocks. A class is studying a population of planaria in a nearby shallow stream. The graph
below shows data collected over 11 weeks.
After 5 weeks, the population decreased, and students concluded that the stream did not have
enough food to support a large population of planaria. If the trend continues, how many
planaria will be living by week 12.
A)600
B)500
C)400
D)300