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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 investigation? A. experimental
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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 investigation?

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

User Guilhebl
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answer is d observational
User Pavel Feldman
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The answer is D I took the test
User Surveon
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