Human beings show signs of stress not when they are actually crowded, but when they feel crowded

Summing up the research on the determinants of sexual orientation, we can say which of the following with confidence?

a) Sexual orientation is a choice. b) Sexual orientation has a degree of heritability. c) Sexual orientation is caused by hormone exposure prenatally. d) Sexual orientation is a result of family life and childhood experience.

Which of the following statements is true when comparing language development in different cultures?

A) Babies in some cultures do not coo before they babble, as they do in most other cultures. B) In some cultures, the use of holophrases begins at about the age of 18 months. C) The use of holophrases seems to precede the use of telegraphic speech in every language. D) In some cultures, babies' first words do not appear until much later than other cultures.