By the end of the fourth week, the embryo’s head is apparent and the eyes, nose, mouth, and ears begin to form. How long is the embryo at this point?

Bram does not ever want to get married. The idea of a lifetime commitment makes him anxious and uncomfortable, and any time a girlfriend brings up the subject of marriage, he breaks up with her. According to Erikson, Bram will not successfully resolve the ____________ crisis.

Twenty-eight month old Nicole saw her friend crying and she responded by giving her friend a toy. Which emotion was Nicole expressing?

Some propose infants have a preference for sweet-tasting items as an adaptive principle because ____.

Between now and 2050, what will the increase in population in the United States be nearly entirely due to?

In this type of attachment, toddlers use the mother as a secure base from which to explore when the mother and toddler are together. When separated from his or her mother, the toddler cries and then is very happy when she returns.

Many infants begin “sleeping through the night” around four months. A couple of months later they may begin waking during the night again. Why?

Belinda’s parents are divorced, but they work together to be sure that they have open lines of communication with their daughter’s teacher and attend as many school functions as possible. The strong interconnection between Belinda’s parents and the various aspects of her school is an example of the ___________________.

Between now and 2050, the increase in the population of the United States will be nearly entirely caused by what?

If a fetus has the sex chromosomes XX, its genotype is ____.