why positive and negative controls in an experiment

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1. Solved 1-Are the controls in this experiment, positive or

   

2. Solved 4A. What are the controls in this experiment?

   

3. 6. Were there any controls in this experiment? Were

   

4. Solved Positive and negative controls are used in the

   

5. Solved Positive and Negative Controls What is a negative

   

6. Negative controls to the experiment presented in Fig 6