Which of the following did Aristotle use to support his theory that the Earth was not flat?
different constellations seen by people in the North and South
u oblate spheroid calculations
u Earth's diameter
satellite images
shadow of the Earth during an eclipse

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