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Natasha2012 [34]
3 years ago
7

What is the most difficult part of a controlled experiment?

Biology
2 answers:
aniked [119]3 years ago
5 0
3.) Testing multiple variables.
Andrej [43]3 years ago
3 0

Answer: testing only ONE variable

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Marta_Voda [28]
I would say C.
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Gland that controls the metabolic rate
oksian1 [2.3K]
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gtnhenbr [62]

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