Answer:
The independent variable could be:
- square units of paper towel that are wet / have absorbed
- volume of liquid that has not been absorbed
- volume of liquid that has been absorbed
Explanation:
The independent variable has to be something that can be quantitatively measured and that will give us an accurate depiction of how well the different paper towel brands can absorb things. Hence, an answer like "amount of water absorbed" is not quite enough because we need to know what exactly we're measuring. Volume or area are both feasible options.
