gcthomas said:
"Evolution is the change in the inherited characteristics of biological populations over successive generations.
Dave, as you have been told before, that is not the meaning of evolution. " (Wikipedia)
You are guilty of dishonesty here, misrepresenting a theory in order to criticise! The idea of a single ancestor is a natural deduction from the success of evolution, but it is not a requirement of the theory. If it was discovered that there were two separate ancestral lines, evolution would not be dimmed at all. Evolution theory ≠ single common ancestor theory. Different names, different theories.
Evolution of cells
"The evolution of cells refers to the evolutionary origin and subsequent evolutionary development of cells. Cells first emerged at least 3.5 billion years ago. The origin of cells was the most important step in the evolution of life on Earth."--Wiki
Every living thing has evolved from the first cell.
"All cells come from preexisting cells. (They) contain the hereditary information necessary for regulating cell functions and for transmitting information (DNA) to the next generation of cells."--Wiki
"Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions."--Wiki
Evolution begins with the first cell and is a process where by new cells add more information and greater complexity to living things through time.
All cells carry out a special function, they all have a purpose.
The problem with evolution theory is that it proposes that chance/unplanned/purposeless mutations end up having purpose, a self contradiction.