Chemists and physicists often have to manipulate and control a variable that they want to study. Scientists who need to control a variable must perform which type of scientific investigation? A. experimental

Chemists and physicists often have to manipulate and control a variable that they want to study. Scientists who need to control a variable must perform which type of scientific investigation?

A. experimental
C. comparative
B. free exploration
D. observational

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Chemists and physicists often have to manipulate and control a variable that they want to study. Scientists who need to control a variable must perform which type of scientific …

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