Amain sequence star becomes a after it uses up the hydrogen in its core. a. nebula c. black hole b. supernova d. giant select the best answer from the choices provided a b c d

a. nebula

A nebula is a mist of particles, particularly and ionized gases hydrogen and helium. Basically, the word was adopted to represent any distributed gigantic object, comprising galaxies across the Milky Way. Andromeda Nebula was sometimes also known as part of the Andromeda Galaxy which re[present a gigantic mist of hydrogen.

apartheid, (afrikaans: “apartness”) policy that governed relations between south africa's white minority and nonwhite majority and sanctioned racial segregation and political and economic discrimination against nonwhites. people should not get this wrong. i was just answering a question.

explanation:

aids