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Body plan of a crustacean, as represented by a shrimp
A fixed action pattern elicited by a sign stimulus.
An Overview of Perceptual, Stimulus–Response (S-R), and Motor Learning
An orange-red biohazard symbol indicates that bloodborne pathogens may be present, and items should ...
A wrench symbol warning lamp on a Ford vehicle. The symbol can also be green.
Four Possibilities in Judging the Presence or Absence of a Stimulus