In many countries the spread of AIDS was impacted greatly by __________.
a. tourism
b. the importing of meat products
c. the prevalence of large populations of gay people
d. the prevalence of mosquitoes
In less developed countries, modern farm methods such as damming waterways to provide irrigation __________.
a. improve the health of all in the area by allowing more grains to be grown
b. create wealth that improves the community's living conditions
c. often create environmental change that leads to disease
d. improve health by supplying clean water
Diseases such as plague, tuberculosis, cholera, leprosy, and syphilis benefited from the growth of cities, because __________.
a. population density was greater, making it easier for microbes to spread
b. people in cities had fewer morals than those in rural areas
c. there were fewer doctors per person in the cities than in rural areas
d. sanitation was non-existent
The pollution of the oceans by humans creates breeding grounds for microbes, which then multiply and evolve into new resistant strains that are then reintroduced into the human population, causing epidemics of new forms of old diseases.
Indicate whether this statement is true or false.
Hunting and gathering societies were most often infected by pathogens, because __________.
a. they lived in small groups that were widely scattered
b. they had interfered with the pathogen's non-human host
c. they had inadequate nutrition which weakened their immune systems
d. they had been stung by insects
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