What is the top of the saturated zone called

Which entry is in the wrong position in the table?

Several billion years ago which gas was the least prevailant in the atmosphere

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