According to the article Old Folks at Home, concerning the ability of older people to perform household tasks, about what percent of elderly people live in institutions?

The defining feature of Tourette's disorder is:

a) the presence of vocal or motor tics. b) an irresistible urge to steal objects that are not needed. c) an irresistible urge to set fires just for the joy of seeing them burn. d) an unusual lack of interest in relationships with other people.

The thin outer ring of cells on a blastocyst, termed the trophoblast, will become the

A) new organism's skin and hair. B) structures that provide protective covering and nourishment. C) embryonic disk. D) nervous system and skin.