if your doing an experiment about if sugar or salt will caused fermentation within the yeast.and you have Cup 1 with warm water ;yeast and sugar than cup 2 contains warm water:salt and yeast Finally cup 3 you have warm water and yeast will cup 3 be the control group or will you need a cup 4 with yeast and nothing else to be the control group or will cup 3 be the control group in this experiment.

and the experimental group will be the 2 other cups 1 and 2 right?

cup 3 will be your control because yeast will not activate till its placed in water

In this experiment, cup 3 with warm water and yeast would not be considered the control group. The purpose of a control group is to serve as a baseline for comparison, where no treatment or intervention is applied. It helps to determine if any observed effects are due to the variables being tested or to external factors.

In this case, since you want to compare the effects of sugar and salt on fermentation within yeast, the control group would require a cup with warm water and yeast only, without the addition of sugar or salt. Therefore, a cup 4 with yeast and nothing else would be necessary to serve as the control group in this experiment.

In this experiment, you are testing the effect of sugar and salt on fermentation by using yeast. To determine the control group, you need to have a group that does not contain the substance you are testing (sugar or salt). This allows you to compare the results of the experimental groups (cups 1 and 2) to the control group and see if there are any differences.

In this case, cup 3 with warm water and yeast alone is not considered a control group because it still contains yeast, which is part of the experimental group. To have a proper control group, you would need to include an additional cup, cup 4, where you only have warm water with no sugar, salt, or yeast added.

So, cup 4 with warm water only would serve as the control group in this experiment. By comparing the results of cups 1 and 2 (where you have sugar and salt, respectively) to the control group (cup 4), you can determine if sugar or salt has an effect on fermentation.