D
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Which is the best evidence that cell division is occurring constantly in our bodies?

### Choices:
A. The body has to keep breathing around the clock.
B. Active people often require more food than inactive ones.
C. There are many different types of tissues in the human body.
D. Human beings shed millions of

### Answer:
