Number the steps of stellar evolution in the correct order. Stellar core heats as it grows; nuclear fusion begins and a star is born.
Nebular cloud of gas and dust.
Nuclear energy runs out; death; possible supernova.
Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened, disk.
Condensed material begins to combine and form a core center. As it warms, a protostar is formed.
Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova. (Subject is actually earth and space science)