Write a paragraph about eli whitney, using the terms cotton gin, patent, and interchangeable part and explaining their effects.

answer; collective security;

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.