Approximately how many different human languages are being spoken today?

Students from a fourth-grade classroom in Canada were asked which of the following occupations were jobs men work in. Which of the following would be an occupation these students would name?

a. librarian b. astronomer c. nurse d. supermarket clerk

Children conceived through in vitro fertilization

A) may be genetically unrelated to both of their parents. B) tend to develop insecure attachments to their parents during infancy. C) cannot be born to postmenopausal women. D) tend to be less well-adjusted than their naturally conceived counterparts.