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Tpy6a [65]
3 years ago
10

Ned is designing an experiment to test which hand sanitizer kills the most E. coli bacteria. In order for Ned's results to be va

lid, what must he do?
Biology
2 answers:
Kay [80]3 years ago
7 0
Have a control. You have to have something to compare your experimental results or else your results could be random chance. 

kondaur [170]3 years ago
7 0
Test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level
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