Refer to the graph below showing one of the results from G.F.Gause's classic competition experiment on three species of Paramecium.P.caudatum feeds on floating bacteria; P.bursaria feeds on yeast cells. 
Which statement best describes the relationship between the two species?
Definitions:
Negative Reinforcement
A behavioral concept where the removal of an unpleasant stimulus increases the likelihood of a behavior being repeated.
Psychological Factor
An element of human psychology that influences thoughts, feelings, and behaviors.
Etiology
The study of the causes or origins of disease or abnormal conditions, including factors contributing to the development of diseases.
Diathesis-Stress Model
A psychological theory that explains behavior as a result of a predispositional vulnerability together with stress from life experiences.
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