Answer:
Nebula → Average Star → Red Giant → Planetary Nebula → White Dwarf
Nebula → Massive Star → Red Supergiant → Supernova → Neutron Star or Black Hole (for the second box)
-TheUnknownScientist 72
top- nebula average star, reg giant, planetary nebula, white dwarf
bottom- nebula, massive star, red supergiant, supernova, neutron star-black dwarf
