yahni202 yahni202
  • 12-10-2019
  • Biology
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234483279c20
234483279c20 234483279c20
  • 12-10-2019

Answer: C) Tim did not use a control group

Explanation:

because.....

the whole point of a control group is where comparisons are made in an experiment.

* Hopefully this helps:) Mark me the brainliest:)!!

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hello2006
hello2006 hello2006
  • 12-10-2019
i think c too!!!!!!!!!!!!!
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