Which statement about the results of the crusades is not true?
a. europeans learned about science and medicine from the islamic world.
b. tensions between jews and christians increased because crusader armies had slaughtered jews.
c. the holy land remained firmly under the control of christian crusaders.
d. muslims and christians blamed each other for the series of bitter wars.
a?

It is letter A.  Europeans learned about science and medicine from the Islamic world. The Muslims did control Jerusalem for a time, that they forced the Christians out of it.

In some articles that I have read,  regaining control of the historic lands of Canaan and Judea by the Jews, creating their own state in the ancient territory of Israel, is also not a result of the crusades.

answer; ///i believe that the correct answer is (baldassare castiglione.

when a country suffers, for example, a drought period, the market product is affected for a low offer, in this case, potatoes; the government has to tax to the households, which have to give more money for the potatoes which they consume, that situation make them consume substitute goods even through loans, it could increase the financial market movement and the inflationary phenomena, the business has to increase salaries in order to the employees could buy a more expensive food (potatoes) and in order to inflation tha business had to buy expensive supplies in the factor market, while the rest of the world have to gain more money to consume the same amount of potatoes.