​Young Marvin, just a few months of age, is growing at a slo…

​Young Marvin, just a few months of age, is growing at a slower rate than would be expected for his age. He has heart problems and a slightly misshapen face, and is often very fussy and difficult to soothe. Which of the following substances did his mother likely ingest on a regular basis during her pregnancy?

​Randi is pregnant for the first time. Given the frequency w…

​Randi is pregnant for the first time. Given the frequency with which twins and triplets have occurred in her family, she is understandably concerned that she will have a multiple-birth pregnancy. If you were her gynecologist, which of the following prenatal tests would you recommend to either confirm or rule out the number of babies she is carrying?