Which of the following statements describes the relationship between mass and the expected lifetime of a star? larger stars undergo fusion reactions for longer periods than small stars. medium-sized stars undergo fusion reactions for longer periods than larger or smaller stars. smaller stars undergo fusion reactions for longer periods than large stars. a star's mass has no effect on how long it will undergo fusion reactions.

The longest lived stars are small stars, therefore they undergo fusion longer than any others. The mass of large stars causes more reactions which eventually create iron in its core. Once created, the iron causes a chain reaction leading to a super nova. medium stars also burn fuel faster and eventually cannot contain itself and begins to expand until it's fuel runs out. Then it shrinks to a diamond the size of a few city blocks but is more.massive than earth. small stars can live for trillions of years though