What is the main case of the islamic worlds hardship in the thirteenth century a. mongol tribes invaded muslim lands b. western europeans invaded muslim lands c. famine and diseases introduced for africa d. dissension between rival factions of islam

The appropriate answer is b. Mongol tribes invading Muslim lands. The Mongol tribes had been empowered Genghis Khan and as such had become a formidable hoard of conquerors that had seized much of the Eurasian landmass and the ruling Islamic caliphate in the west. The hardships during this period marked the end of the Golden age of Islam.  

Question- How did the Mexican Revolution influence Dream on a Sunday Afternoon in Alameda Park?

Answer- Here, the renowned print-maker depicted La Catrina as a skeleton in order to critique the Mexican elite. In Dream of a Sunday Afternoon in Alameda Central Park, Rivera reproduces the original Posada print and adds an elaborate boa reminiscent of the feathered Mesoamerican serpent god Quetzalcóatl around her neck.  This fifty foot fresco takes the viewer on a Sunday walk through Alameda Park, Mexico City's first city park that was built on the grounds of an ancient Aztec marketplace. The large mural represents three principal eras of Mexican History: The Conquest, The Porfiriato Dictatorship, and The Revolution of 1910.