Which event takes place first in the stages before the brith of a star

nuclear fusion

Explanation:

gravity pulls gas and dust together a protostar forms as mass increases nuclear fusion begins under high pressure

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

there are two significant figures.