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    Why is it important to use the same pipette in adding for example bromocresol drops to the tubes I'm working on?

    Thanks.
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    Why do you think?
    Hint - variables.
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    (Original post by ThisIsOurDecision)
    Why do you think?
    Hint - variables.
    Thanks for your reply.

    Not getting it yet really. What are the variables that will exist here?
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    keep the control variables the same to make sure the test is valid- i think :hmmm:
 
 
 
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