What causes the “heat island” effect? a.
heat produced from a large number of people
b.
the materials used in building cities retain heat
c.
the large amount of reflected light from glass windows
d.
all of the above

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