Triangular sail developed by Arab or Indian merchants which was eventually adopted by European ship owners to improve the maneuverability of their ships. It could catch crosswinds and be used to drive a ship along its chosen course. The captains of caravels and galleons used this type of sail in conjunction with several other kinds of sails to cross the Atlantic and Pacific Oceans.
In a continuous reinforcement schedule the desired behavior is reinforced each and every time it occurs. This continuous schedule is used during the first stages of learning in order to create a strong association between the behavior and the response.
Powhatan Confederacy were the indigenous people of Virginia. The based their life on hunting and gathering. It was a small group of people living in Virginia. The Powhatan Confederacy and the British settlers did not have a good relation from the beginning. The british settlers thought that they would be accepted by the natives of Virginia, but it actually started a conflict between them and was the major reason behind the fall of the Powhatan Confederacy. The settlers thought that the Powhatan Confederacy would be the suppliers of food after their arrival, but the natives did not have much extra food. This started the main conflict.
Answer: G. Nullification Crisis
Explanation: Good luck! :D