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I think what you are thinking Will and you are on the right track! When you water plants normally in your house, you use tap water which is usually room temperature right? Or at least I do. There is something known as a control group in science and that is where you don't change the independent variable (water temperature). I think having some more temperatures groups would make this experiment a little better. :)
Having 5 groups such as room temperature (70˚F), Warm (85˚F), Hot (100˚F), Cool (55˚F), and Cold (40˚F) would give you a better idea of how temperature effects growth. If you only had 2 groups, it is possible that the 2 extreme temperatures might have been too extreme for growth. But by having less extreme and extreme groups, you can the true effect of temperature. I'm don't use Fahrenheit so those temperatures might not be very accurate with the descriptions. Saying this can you always remember to report the unit (F) beside the temperature so I do not forget that we are using Fahrenheit.
I like how you are being inclusive of everybody by stating to use the temperatures that everybody's sink goes to.
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A good way to guide the students in planning
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