It is because of massive nature of the Sun, it exerts very high Gravitational force on the Earth, more than any other heavenly body in the space
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They usually settled outside the city walls.
A reinforcer is a stimulus that increases the probability that the behavior will occur again. An example of a reinforcer would be a dog treat. If you want your dog to follow the command "sit", you would follow the behavior with a dog treat, or reinforcer, to ensure that the behavior of "sit" would occur again.
Answer:
In the terminology of classical conditioning, the smell of tequila is now a conditioned stimulus.
Explanation:
The day that Erin drank too much, the tequila was an unconditioned stimulus, producing a natural and unconditioned response, the vomit. Now the tequila has been paired with its smell, and the pure smell became the conditioned response, producing the same reaction as the tequila.
1. The rulers who came to power after Charlemagne failed to defend the empire.
2. Europe was threatened by Muslims, Magyars, and Vikings in the 9th and 10th centuries.
