Popper argued that it was crucial for scientists to maintain a “critical attitude,” whereby they would: Group of answer choices

be critical regarding all human knowledge

be critical of all scientific theories

actively search for refutations of the prevailing theories

be critical of all beliefs other than their own

i would say b. research typically uses a variety of sources

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.