The actual true answer is D.. trust me its the correct answer
Levittown became the first mass-produced suburban housing developmet in new york in 1948
Levittown was created by William Levitt in 1947. Within 3 hour of its launching, Levittown managed to sell 1400 houses
hope this helps
Events in the dog's environment.
The secretion by the digestive glands in acknowledgment of stimuli correlated with the ingestion of food is called Psychic Secretion. such as the appearance and smell of food, the circumstances under which it is consumed is called Psychic Secretion.
Salivating to food in the mouth is reflexive, this involves no learning. However, dogs don't generally salivate at the perception of an empty bowl or the noise of footsteps. These unusual acknowledgments fascinated Pavlov, and hence he called the dogs as “psychic secretions”.
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