17. The diseases that are caused by water pollution in the major cities of developing countries are mainly due to the___________________________________

Group of answer choices

a. practice of swimming in water contaminated by toxic chemicals

b. high number of industries that dump their wastes into surface water

c. lack of waste treatment systems to accommodate the population

d. high amount of runoff that includes pesticides, fertilizers, and animal waste

e. high use of pesticides and fertilizers by urban residents

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Question 181 pts

18. Slums are usually dwelling places that are___________________________________

Group of answer choices

a. condemned by the city but illegally occupied

b. illegal and built by squatters

c. legal but have inadequate living conditions

d. on undeveloped lands in the outskirts of a city

e. small but up to city code

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Question 191 pts

19. The principal difference between shantytowns and slums is that shantytowns are_________________

Group of answer choices

a. illegal and built by residents

b.. built by the city but condemned

c. built on land that the residents own

d. maintained by the city

e. legal but below code

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Question 201 pts

20. Squatter towns are often dangerous places to live because the land they are on is commonly____________________________

Group of answer choices

a. in the densest parts of the city

b. owned by powerful political figures

c. close to major highways

d. close to new building construction zones

e. unstable, polluted, or near industrial sites