3. control variables: why will you incubate all cells in the same food coloring solution for the same length of time?

We will incubate all cells in the same food coloring solution for the same length of time because the reason is that we can achieve the results which are accurate by this method otherwise there will be error and we cannot get accurate results. Therefore, we incubate all cells in the same food coloring solution.

i would have a lunch. it's one big package of food, making it one food. : p