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diamong [38]
3 years ago
8

To be valid, an experiment must not include A. only one variableB. a controlC. both a control and a variable, which are treated

in parallelD. more than one variable
Social Studies
1 answer:
tia_tia [17]3 years ago
3 0

Answer:

D

Explanation:

More than one independent variable makes an experiment unfair.

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