Eighteen-month-old Bernice hears two different languages at home as each of her parents speaks English and Spanish. Which scale on the Bayley Scales would accurately measure her use and understanding of language?

Studies of unmarried mothers show that

A) they tend to wait for marriage before having additional children. B) most are motivated to complete high school in an effort to better the lives of their children. C) lack of material resources greatly reduces the likelihood of earning a high school diploma. D) their children are less likely to become adolescent parents.

The hair cells of the cochlea serve a function in hearing that is similar to the function of which of the following in vision?

a. iris b. blind spot c. rods and cones d. cornea