Coal is formed when layers of plant matter accumulate at the bottom of a body of water and are protected from biodegradation and oxidization. over time, the properties of the original material change. what evolutionary significance, if any, does this have?

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell