1. a material consists of an element. how many types of atomic structures are present in this substance? a no atomic structures are present as this is a pure substance. b one type of atomic structure is present as this is a pure substance. c two types of atomic structures are present in this substance. d several types of atomic structures are present in this substance.

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