Question

when the stars hydrogen runs out, the core starts to collapse and gets denser and hotter. what element is now used as fuel for fusion? this question is worth 1 point(s) oxygen carbon helium hydrogen

Explanation:

When a star's hydrogen fuel is exhausted, the core collapses and helium - which was produced by hydrogen fusion earlier - starts to be used as the fuel for further fusion reactions in the star's core.

Answer:

C. Helium