Answer the following question given this paragraph: 

Look at the Figure below of water (H 2 O) and hydrogen peroxide (H 2 O 2 ), and read about these two compounds. Both compounds consist of hydrogen and oxygen, but they have different ratios of the two elements. As a result, water and hydrogen peroxide are different compounds with different properties. If you’ve ever used hydrogen peroxide to disinfect a cut, then you know that it is very different from water!.


Q: What elements do water and hydrogen peroxide consist of?

 Choices:

- carbon and oxygen

- calcium and oxygen

- hydrogen and helium

- hydrogen and oxygen

A:
hydrogen and oxygen
