The concept map below shows the flow of energy and materials in photosynthesis and cellular respiration.

Which molecules are represented in the figure by the number 2?

a
H2O and O2

b
H2O and CO2

c
sugars and CO2

d
sugars and O2

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