What percentage of U.S. families are single-mother families?

Nutrients and oxygen are transferred from a mother to her developing fetus through the

A. Embryo. B. Ovaries. C. Teratogens. D. Placenta.

A time machine provides the opportunity to interview Sigmund Freud. During the interview, Freud admits that he never wanted to attend medical school. When you ask him how he made it through, he says, "I had eidetic imagery."

Because you don't want to reveal your lack of knowledge, you don't ask what he means. If you look up the term later what will you find? a) He relied on the ability to associate odd images with material he needed to remember. b) He had photographic memory, which helped him remember the material he had to learn. c) In order to remember the long list of diseases he would encounter, he created drawings that helped him remember. d) He was able to imagine how cells in a patient's body were acting when he prescribed drugs and thus he could adjust dosages.