Problem: Mexico City is located in the Valley of Mexico, sometimes called the Basin of Mexico. This valley is located in the Trans-Mexican Volcanic Belt in the high plateaus of south-central Mexico. It has a minimum altitude of 2,200 meters (7,200 feet) above sea level and is surrounded by mountains and volcanoes that reach elevations of over 5,000 metres (16,000 feet). This valley has no natural drainage outlet for the waters that flow from the mountainsides, making the city vulnerable to flooding. Drainage was engineered through the use of canals and tunnels starting in the 17th century.
Where is Mexico City located?
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Answer: Valley of Mexico

Problem: Among the vast varieties of microorganisms, relatively few cause disease in otherwise healthy individuals. Infectious disease results from the interplay between those few pathogens and the defenses of the hosts they infect. The appearance and severity of disease resulting from any pathogen, depends upon the ability of that pathogen to damage the host as well as the ability of the host to resist the pathogen. However a host's immune system can also cause damage to the host itself in an attempt to control the infection. Clinicians therefore classify infectious microorganisms or microbes according to the status of host defenses - either as primary pathogens or as opportunistic pathogens:
What can a host's immune system do to a host?
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Answer: cause damage

Problem: In 77 BC, the senate sent one of Sulla's former lieutenants, Gnaeus Pompeius Magnus ("Pompey the Great"), to put down an uprising in Spain. By 71 BC, Pompey returned to Rome after having completed his mission. Around the same time, another of Sulla's former lieutenants, Marcus Licinius Crassus, had just put down the Spartacus-led gladiator/slave revolt in Italy. Upon their return, Pompey and Crassus found the populares party fiercely attacking Sulla's constitution. They attempted to forge an agreement with the populares party. If both Pompey and Crassus were elected consul in 70 BC, they would dismantle the more obnoxious components of Sulla's constitution. The two were soon elected, and quickly dismantled most of Sulla's constitution.
Which former lieutenant of Sulla had dismantled most of the constitution that Sulla had crafted?
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Answer:
Pompey