8. Development Across the Life Span

According to the cellular-clock theory, telomeres ______, which ultimately causes aging.

Your roommate tells you to take care of your body and not subject it to stress, because it will make you age faster. Your roommate's advice is consistent with the _____ theory of aging.

One theory suggests that the effects of aging are produced by oxygen molecules with unstable electrons bounding around and damaging structures inside our cells. This is called the _____ theory.

In the _____ theory of aging, cells are limited in the number of times they can reproduce to repair damage.