Question

how has the study of mitosis affected scientists knowledge of cancer?
it led to a study of how to induce cancer cells to divide more rapidly.
it led to an understanding of how cancer cells divide so rapidly.
it led to the development of contact - inhibition regulators.
it led to the discovery of how to prevent cancer cells from dividing

Explanation:

Mitosis is the process of cell division. Cancer cells divide rapidly. Studying mitosis helps understand the mechanisms of cell division. By knowing how normal cells divide (through mitosis study), scientists can contrast it with cancer cell division. Contact - inhibition regulators are not directly a result of mitosis study in this context. Inducing cancer cells to divide more rapidly is not a goal. And preventing cancer cells from dividing is a more complex process than just what mitosis study directly led to. The key is that mitosis study gives an understanding of cell - division processes, which in turn helps understand why cancer cells divide so rapidly.

Answer:

It led to an understanding of how cancer cells divide so rapidly.