Educational worksheet for identifying controls and variables in science experiments.

Based on the analysis of the four scenarios presented in the worksheet, here are the solutions for identifying the controls and variables:

Scenario 1: Smithers and the Special Juice
- Control Group: Group B (the group that did not drink the special juice).
- Independent Variable: The special juice (whether or not the workers drank it).
- Dependent Variable: The number of stacks of papers stapled (productivity).

Scenario 2: Homer and the Green Slime
- Control Group: The half of the shower sprayed with water.
- Independent Variable: The type of liquid sprayed (coconut juice vs. water).
- Dependent Variable: The amount of green slime remaining after 3 days.
- Initial Observation: The shower was clogged with a strange green slime.
- Conclusion: Coconut juice does not remove the green slime, as there was no change on either side of the shower.

Scenario 3: Bart and the Microwaved Mice
- Control Group: The 10 mice that were not exposed to microwaves.
- Independent Variable: Exposure to microwaves (whether or not the mice were microwaved).
- Dependent Variable: The strength of the mice (measured by their ability to push heavy objects).

Scenario 4: Krusty and the Itching Powder
- Control Group: The group of subjects who received the original itching powder.
- Independent Variable: The type of itching powder used (original vs. new).
- Dependent Variable: The duration of the itching sensation.

These answers correctly identify the key components of each experiment, allowing for a clear understanding of how the experiments were designed and what variables were being tested.