Humans live in deserts, jungles, mountains, frenzied cities, placid retreats, and space stations, which illustrates how our mental abilities have helped us to be more

Most adults and older children cannot remember events that happened before the age of 3 because

A) they cannot translate early preverbal memories into language. B) early memories are stored in an explicit memory system that is difficult to recall. C) long-term memory does not emerge until around age 7. D) they have most likely forgotten these early memories due to the passage of time.

One reason that low-SES kindergarteners have vocabularies only one-fourth as large as those of their higher-SES agemates is that they

A) rely on infant-directed speech. B) do not use telegraphic speech. C) are read to less often. D) have more verbal stimulation in their homes.