The independent variable of this investigation would be 2. The concentrations of ethylene spray. This is the variable that you will manipulate to observe its effect on the ripening of bananas.
You investigate the effect of different concentrations of ethylene spray on ripening in bananas. What would be the independent variable of this investigation?
1. The color of the bananas
2. The concentrations of ethylene spray
3. The length of ripening time
4. The age of the bananas
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