In this example, john's whistling is serving as a discriminative stimulus.
This procedure, studied by Ivan Pavlov, shows a stimulus ( in this case the action of John's whistling) and a response ( the cattle run to the food trough).
Pavlov studied it with dogs. He realised that when a trainer fed them, dogs salivated. So, he presented the dogs with a "stimulus" ( the sound of a metronome) and when he gave the dogs food. After a few repetitions, when the dog listened to the stimulus, it salivated.
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Modern social change protests are a group of sexist and racist individuals who claim that they want to stop those things by showing those things to the "oppressors". For example, the black lives matter movement claims that they want to end racism, but if you actually look at the fact that they intentionally harm the lives of white people and advocate for racism against white people in schools and in society. The Modern feminist movement is now sexist against men, and have pushed for fundamentally sexist rules, even when women, legally have more rights than men in America. The "Anti-Facist" or "Antifa" is a terrorist organization who's entire purpose is to cause harm to anyone with a conservative mindset; this is actually written in their own description. These are examples of "social change" protests that are intentionally cause harm, but there are ones, such as the march for life, that don't cause harm to anyone; instead, they do a lot of good things.
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1.politica instability
2.community conflict
3.knowledge and communication networks
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de mexico o los estados unidos ?
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Prince Henry the Navigator provided Columbus with the funding he needed to build the most innovative ships in Europe. The scientific discoveries of the Portuguese allowed for navigation of the North Sea and trade with Viking merchants.
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