Question

which of these forms as part of the life cycles of both low - mass and high - mass stars as a result of a star - forming nebula collapsing and spinning?
protostar
black hole
supernova
white dwarf

Explanation:

When a star - forming nebula collapses and spins, a protostar forms first in the life - cycle of both low - mass and high - mass stars. A black hole forms from the collapse of a very high - mass star at the end of its life. A supernova is an explosion of a massive star at the end of its life. A white dwarf is the remnant of a low - mass star at the end of its life.

Answer:

A. protostar