Which of the following is not an example of infrastructure.
a. a railroad
b. a school
c. a telephone line
d. a dairy farm?

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answer; occurs if the conflict is recognized logically and intellectualized;