Cells differentiate and become specialized cells in order to carry out different functions from embryonic stem cells. However, if you're asking how a cell came into existence, that's a very good question, and no body really knows. An interesting thing to know though, is that when you put phospholipids (what the lipid bilayer of cells is made of) into water, they spontaneously form a lyposome. The reason is because it is the most energetically favorable to do so. This means, that if you have enough phospholipids in solution, you naturally have a cell membrane.
When cells differentiate, they become specialized.
Cells that become too large can either block nutrients to other cells, or become a cancerous cell.
CD8 cells become cytotoxic T cells.
It stimulates the cells in cartilage to become osteoblasts.
In bacterial Cells they become replicated circles of Dna. In eukaryotic Cells they become Chromosome number 4n.
The cells become millions of cells in the human body through the process of replication.
Cells can become cancerous
stem cells
The brain is composed of two types of cells, nerve cells and glial cells.
Stem Cells stem cells
Stem cells
They can be mutated through irradiation.