Air, water, and weather
Response to a stimulus
Fertilizer A will make the KW variety of green bean produce more beans.
Smart people like the same music.
Vitamin C relieves cold symptoms.
There is more than one species of African elephant.
The first plot with traditional pesticide.
The second plot with the new pesticide.
The third plot with no pesticide
There is no control group.
The experiment is a failure
The new pesticide may not be effective.
The control plot was problematic
The new pesticide should be used.
Here's an interesting quiz for you.