The first step in any investigation a.) perceiving a question b.) forming a hypothesis

answer; /// the only one of the above that makes good sense is ( the poor,plz check luck

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.