A species of flowering plant lives in open meadows in temperate regions of North America. Each plant produces either blue, purple, or red flowers.
Several different pollinators visit the flowers, and the plant is preyed upon by
several insect species and herbivores. Butterflies prefer red and purple
flowers and bees prefer blue flowers. The population numbers for this
species have remained constant over the time period shown in the graph.
Data collected over several years for one population of this species are
shown in the graph below. Which of the following scenarios is the most likely
explanation of the data?
Blue
Purple
Red
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