+Final answer:
The wear and tear theory of aging compares the human body to a machine that breaks down due to constant use.
Step-by-step explanation:
The theory of aging that compares the human body to a machine that breaks down as a result of constant use is called the wear and tear theory. According to this theory, the accumulated damage to cells and tissues over time leads to the aging process. This damage is caused by factors such as oxidative stress, environmental toxins, and the wear and tear from daily physical activities.
For example, think of a car that is constantly used without regular maintenance. Over time, the engine and other parts of the car will wear out and break down. Similarly, the wear and tear theory suggests that the human body undergoes a similar process of deterioration due to the constant use it experiences throughout life