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A researcher shows a violent film to one group of participants and a nonviolent film to another before giving both groups a test measuring aggressiveness. Which of the following statements is true?
Planarians
Flatworms belonging to the Turbellaria class, known for their remarkable regenerative ability and as subjects of biological research.
Circulatory System
The body system that functions in internal transport and protects the body from disease.
Cephalopods
Cephalopods are a class of mollusks that include squid, octopuses, and cuttlefish, known for their advanced nervous systems, complex eyes, and ability to change color and texture.
Open Circulatory System
A type of circulatory system found in some invertebrates where blood flows freely in the body cavity, bathing organs directly in blood.
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