Studies have found that certain chemicals that help repair damaged cells only function while we sleep. What theory best explains this?

According to the article Coming of Age about the timing of puberty and adolescent behavior, sexual maturation was measured by:

(a) a blood test (b) a self-rated comparison with drawings (c) parental surveys (d) a ratio of bone mass to muscle mass

A father's use of alcohol and illegal drugs has no significant effect upon the development of the fetus

Indicate whether the statement is true or false