meters centiliters millimeters liters
I gave my students this multiple choice question: Students compared the growth rate of the roots of basil plants in three different water solutions. Measurements were recorded every other day for eight weeks. Which unit of measure is most appropriate for this investigation?

Only one answer is correct among these 4 choices:
- meters
- centiliters
- millimeters
- liters

Could you tell me which one is correct?

millimeters