It could be understood that Attention deficit hyperactivity disorder (ADHD) is not inherited. It might also be good to add that the cause of this disorder is unknown but it might be identify a number of possible differences in the brain, there might be other factors such as <span>being born prematurely, having a low birth weight or <span>smoking, alcohol or drug abuse during pregnancy.</span></span>
Well, I'd say it was Skinner because the rest didn't even research operant conditioning, they were only interested in classical one (which involved just association between 2 stimuli).
The correct answer to this open question is the following.
The inference about the states or routes that go beyond what is explicitly shown on the map is the following.
During the time when northerners helped black slaves from the South to escape from the southern plantations through the underground railroad, most of the black people tried to escape from states such as Alabama, Mississippi, Louisiana to Illinois and Ohio. Black people from Virginia tried to escape to Buffalo and Vermont. Many times, slaves tried to cross the border to Canada, to be free.
We can say this because widths arrows represent a major number of slave routes taken by black people.