Question

Which of the following statements is true?

A. Calcium and potassium are good for your body.
B. Most of the atmosphere is made of oxygen and helium.
C. The center of an atom is made of protons and electrons.
D. All of the above.

Answer 1

I believe A.
Calcium and potassium help with blood pressure, muscles, and bones.

For b, there is little helium in the atmosphere.
For C, the center is made of neutrons and protons, electrons are far away.