The wear-and-tear theory proposes that we age because new cells are imperfect copies of old ones

What 21st century character game(s) became popular worldwide, especially with boys?

a. Pokemon b. "king of the hill" and soccer c. hopscotch and capture the flag d. four square and baseball

The desire to affiliate with others seems to be a(n) _________ characteristic of the human species

a) recent b) basic c) unnecessary d) optional