You want to teach a dolphin to swim through a hoop. First, you reward the dolphin for swimming near the hoop. Next, you reward the dolphin for touching the hoop. Then, you reward the dolphin for sticking his nose through the middle of the hoop. Finally, you reward the dolphin for swimming through the hoop. Psychologists call this process .

for many centuries there were important factors which the economies of the muslim empires developed increasingly. they applied economic procedures in production, investment, finance, taxation and property. they used to tax certain goods (for example: harvest), they charged interest on money lent, they signed contracts with merchants; they relied on a common currency, and they used checks as well as promissory notes. with the money collected by means of taxation, the government provided the needy with an income. in addition, trading networks covered huge distances, so far regions started to have contact and exchange goods. this trade network covered areas of asia, africa and europe.

answer; protectionism fosters competition and keeps price regulated;

answer; delirium is a common adverse reaction seen when elderly patients take diphenhydramine;

answer; participant observation method;