The 1979 revolution was a popular revolution against an autocratic but progressive monarch which turned into a backwards religious movement sending Iran back 200 years in time.
The Arab spring was a popular revolution sparked by demands for democracy against horrible dictators, which ultimately backfired due to civil war following the coups in Yemen, Syria and Libya, unrest in Egypt due to political tensions and high unemployment in Tunisia.
Differences:
Iranian Revolution eventually grew into religious movement, Arab spring was a pro-democracy movement
Arab spring results in civil war, unrest and bad economic times, Iranian Revolution results in Invasion form Iraq and oppression by the government.
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The Great Plague transformed Europe because it caused people to be very cautious not to catch the deadly disease and later on, it killed thousands of people which made some people feel lucky to be alive. This also has made an impact on history because this is such an important time that we hear about and we find it very interesting that a sickness could have killed thousands.
Hope this helps!!!:)
This is true of a parliamentary democracy, like the United Kingdom.
In a Parliamentary system, the executive is usually the leader of the party in the legislative branch and forms a government out of their colleagues in the legislative branch.