Two groups of students were tested to compare their speed working math problems. Each group was given the same problems. One group used calculators and the other group computed without calculators. Independent variable =
Dependent Variable =
Constant variable =
Control group = ​

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Nps pollution is caused by rainfall or snowmelt moving over and through the ground. nonpoint source pollution can include: excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. oil, grease and toxic chemicals from urban runoff and energy production

Examples: mental health problems cardiovascular disease obesity and other eating disordersmenstrual problems skin and hair problems

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle