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Why is the green revolution unlikely to be the final answer in terms of feeding the billions of people that are, and will be, living on earth?
Secondary Reinforcers
Stimuli that have no inherent value but have acquired reinforcing qualities through their association with primary reinforcers.
Coins
Metal pieces issued by a government as money, typically round in shape and used as a medium of exchange for goods and services.
Blue Ribbon
A symbol of high quality or achievement, often awarded in competitions.
Candy
Sweet confections made primarily from sugar or syrup, often combined with fruit, chocolate, nuts, or other flavorings.
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