Lives in Context Video 2.1: UltrasoundClick on the above link to access the Interactive eBook. Once you've signed in, scroll to page 71 and watch the video. When you've finished watching the video, come back to the test and answer the following question:In the ultrasound shown in the video, you observed a variety of fetal structures. Which structure enables the exchange of nutrients, oxygen, and wastes via the umbilical cord?
A. the heart
B. the cervix
C. the amniotic sac
D. the placenta
Answer: D
Psychology
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