Subject: How does a cell evolve from a single-cell to a multicellular organism??

Chlamydomonas is a single-celled organism, and from time to time it divides to 
form two individual cells. Each daughter cell recieves a complete set of 
nuclear control like in the parent cell. During the process of cell division, 
these chromosomes become separated. The Mitosis process happens. Then what 
happens?. How does it turn into a Volvox and how does it go through 
"differentiation"??. Thank-you for takeing your time to read and hopefully 
answer my question. 

Re: How does a cell evolve from a single-cell to a multicellular organism??