Increasing pressure , temperature, and mass in the center of a stellar nebula creates a __ BEFORE fusion occurs. A white dwarf A main sequence star A red giant A protostar Rewatch

## Step 1<br />The problem is asking us to identify the stage of a star's life cycle that occurs before fusion takes place in the center of a stellar nebula. The options provided are a white dwarf, a main sequence star, a red giant, and a protostar.<br /><br />## Step 2<br />A white dwarf is a stage that occurs after a star has exhausted its nuclear fuel. This is not the stage before fusion, so it is not the correct answer.<br /><br />## Step 3<br />A main sequence star is a stage where fusion is actively occurring in the star's core. This is not the stage before fusion, so it is not the correct answer.<br /><br />## Step 4<br />A red giant is a stage that occurs after the star has exhausted its hydrogen fuel and has started to fuse helium. This is not the stage before fusion, so it is not the correct answer.<br /><br />## Step 5<br />A protostar is the stage that occurs before fusion begins in the center of a stellar nebula. This is the correct answer.