Which of these would explain why Jeanette's conclusion may NOT be valid? A) There was no control group.
B) She never formulated a question.
C) The experiment could never be repeated.
D) She should have tested more than two plants

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.

nothing

hope this !

answer; the president uses mass media to gain support for policies;