If you use a solar-powered calculator to calculate the half life of an isotope, you are using what energy source? *
1.Passive solar heat
2.A small generator
3.Photovoltaic cells

I will pee on you

Explanation:

I will pee on you too

a. to encourage apoptosis

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds