What released through nuclear fusion in stars

energy
gas
mass
pressure

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

What are the variables in gay-lussac’s law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas