I believe that Karl Marx believed that capitalism tended to create economic crisis mainly because of the 'boom or bust' quality of capitalist production so that producing according to the world capitalist market price means that when the price is high ie of commodities like gold and silver and copper then production is increased sometimes very sharply, but then it results in a glut of products that people cannot afford to buy so the price drops and there is a depression like the one in the 1930's. But there is not just a recession or depression in the 1930's but in the mining industry it usually takes place cyclically every 5-6 years over and over again and when the price is down then it creates intense hardship for people so that they go deeply in debt or get thrown out on the street.
While many Russian soldiers were on the front during World War I, most of those who remained behind responded to the February Revolution by "joining the riots instead of stopping them," although there were many loyal soldiers as well.
The correct answer is the first one in order: the instability of foreign trade.
The Fall of the Roman Empire is also called Fall of The Western Roman Empire and it was the process in which the Empire failed to enforce its rule and its huge territory was divided into several sovereignities.
Theodosius death, leaving two incapable sons, resulted in a collapsing the field army and also several civil wars which weakened the Roman Empire and helped to bring it down.
He was the first to pasteurize milk in an experiment to see whether boiling a substance (in his experiment, he used chicken broth) decreases its likelihood of being contaminated