This element is the main fuel of stars

Select the options that complete the following sentence. A star is: a giant ball of gas that produces heat and lightmade of solid rockheld together by gravitymade of heavy elements like lead and mercury

Describe how the chemical composition of a star may be determined.

What is the heaviest element directly produced by nuclear fusion in the core of high-mass stars?Group of answer choicesHeliumIronSiliconNickelCarbonGold

On the main sequence, stars obtain their energyGroup of answer choicesfrom nuclear fissionfrom gravitational contractionfrom chemical reactionsby converting helium to carbon, nitrogen and oxygenby converting hydrogen to helium

What type of energy is produced in a star?AfusionBelectricityCfissionDkinetic