The two large land areas linked by Central America are North America and South America.
behavior subject to operant conditioning, and involuntary behavior is everything else. It might be clearer to define voluntary behavior as fully transparent to reinforcement.
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I would say that people can develop phobias from a lot of different things. i would say a big one is child experiences with different things that end up giving them anxiety into adulthood.
The correct answer is Transportation infrastructure
At the beginning of the industrial revolution, the new forms of transportation were very important, as they represented a change in the way both of moving and transporting food, materials and various other elements that were important at the time. Although transport is not so important today, even if it is important, in the industrial revolution the mode of transport structures represented in a significant way the change of developed societies.