Place one piece of bread in a lighted area and one piece of bread in a darkened area, and then observe the rate of mold growth over time.
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the best method to collect primary data is to make a Baseline Data or using the method of Rapid Rural Appraisal.
Two repeats is enough to draw some simple statistics, but they are hardly reliable. Most experiments aim for three as an absolute minimum; the best experiments will run through hundreds of repeats or 'trials', so that a decent sample can be created.
A scatter plot would be best for non-related data points. A line graph would be best for related data points.
Meters or feet would be best, depending on where you live.
Do to its size, the mass of a peanut would probably best be measured in grams.