Answer: How effective is a new toothpaste in reducing cavities? - Controlled Experiment
Which is a better absorber of heat, an object painted black or the same object painted white? - Controlled Experiment
Can plants prepare food even in artificial light? - Observational Study
How does the daytime temperature affect the formation of dew at night? - Observational Study
Why does a rolling ball slow down as it moves? - Observational Study
Step-by-step explanation: