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At birth, the lungs take over from the placenta the job of exchanging oxygen and:

ACarbon monoxide
BCalcium chloride
CCopper dioxide
DCarbon dioxide
Answer & Solution
Correct answer: D. Carbon dioxide
1. Gas exchange must continue after birth. 2. Two gases move in opposite directions. 3. They are oxygen and carbon dioxide. _Source: OpenStax Anatomy and Physiology 2e, Chapter 28, Development and Inheritance._
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