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elena55 [62]
3 years ago
10

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
Chemistry
2 answers:
artcher [175]3 years ago
7 0
Answer is d observational
Inessa05 [86]3 years ago
4 0
The answer is D I took the test
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Rudiy27

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