Explanation: During M phase, cell division takes place and two daughter cells are formed. But the size of these daughter cells is almost half the size of the mother cell. During G1 phase, the doubling of size and cell content take place. The size of the daughter cells increase to the size of the normal cell.
The tremendous heat given off by the nuclear fusion process causes the gas to glow creating a protostar. This is the first step in the evolution of a star. The glowing protostar continues to accumulate mass.
