What is the difference between physical activity and exercise

Physical activity is movement that is carried out by the skeletal muscles that requires energy. Exercise, however, is planned, structured, repetitive and intentional movement intended to improve or maintain physical fitness.

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.