Alex wanted to find out what toothpaste made teeth the cleanest. Everyday she brushed her teeth with a different product and then took a plaque test to see how much plaque was left. She used Crest, Colgate, Close-up, and water. what is the independent variablewhat is the dependent variablewhat is the control variable

Independent: toothpaste brand

Dependent: amount of plaque left

Control: Water

Constants: amount of toothpaste, kind of toothbrush, how long the toothbrushing took.

Explanation:

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; collectivism';