If reinforcers from one unchanged source are depleted and responding in another source increases, we call this
a. Negative contrast
b. Substitutability
c. Positive Contrast
d. Anticipatory Contrast
Answer: a. Negative contrast
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The risk of predation can sometimes have a significant impact on the foraging choices made by animals
Indicate whether the statement is true or false
Bony fishes possess a swim bladder to
A. regulate their buoyancy. B. detect changes in water pressure. C. cleanse the blood of toxins. D. store urine until excreted. E. regulate oxygen concentrations in their blood.
Nonspecific chemical defenses include
A. skin's acidic pH and fatty acids. B. stomach hydrochloric acid. C. lactic acid and electrolytes of sweat. D. lysozyme. E. All of these choices are correct.
Characteristics of chancroid include:
A. sexually transmitted B. occurs mostly in the tropics and subtropics C. lesion develops at portal of entry D. bubolike swelling of the lymph nodes E. All of the choices are correct.