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: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

how is this a question? but yes, they were. if i recall correctly, it was very handy for native americans to use buffalo skin.