Question

which is the first stage in the life cycle of a massive star? (1 point)
white dwarf
nebula
red giant
black hole

Explanation:

Stars form from clouds of gas and dust called nebulae. A massive star's life - cycle begins when a nebula collapses under its own gravitational force. White dwarfs are the end - stage of low - to medium - mass stars. Red giants are a later stage in the life of a star. Black holes can be the end - product of a massive star's life cycle.

Answer:

nebula