While most U.S. births take place in a hospital, about ______ percent occur in freestanding birthing centers

Using "lexical contrast" to interpret the meanings of new words is best done when the child's vocabulary is

a. very small, five words or less. b. moderately small, about 20 words. c. large, 200 or more. d. any number of words.

Humans need approximately _____ to perceive the gist of a scene

A) ?250 milliseconds B) 1000 milliseconds? C) 2 seconds? D) 5 seconds