3.
a researcher finds that blood alcohol levels cause progressive damage to the liver. all the mice in his study were fed the same amount and types of food. different concentrations of alcohol were injected into each mouse. one group of mice does not receive any alcohol at all. the different concentration of alcohol injected into different mice represents the
dependent variable
constant
independent variable
control

4

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explanation:

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project