Answer:
How effective is a new toothpaste in reducing cavities? Observational study
How does the daytime temperature affect the.....- Observational study
Which is a better absorber of heat.... - Controlled experiment
Can plants prepare food even In artificial light.- Controlled experiment
Why does a rolling ball slow down as it moves.- Controlled experiment
Please check if the answers are right first
- AC=Hypotenuse=20
- BC=Base=16
AB:-
Apply Pythagorean theorem





Now
- DE=AB/3=12/3=4
- EF=BC/3=16/3=5.3
- DF=AC/3=20/3=6.6
Now



All citizens fall into one of three social classes