Aresearcher wonders whether an acidic environment affects the growth of frogs. she varies the ph in five different tanks containing ten tadpoles each, and measures the length of the frogs after one year. all frog tanks are provided the same amount of food. what is the dependent variable in this experiment? a. ph of the tanks b. number of tanks c. amount of food d. length of frogs

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