What physiological difficulty might a child born and raised on Mars face upon returning to Earth ($1 ext{g}$)?
Answer
Severe physiological shock to the skeletal and cardiovascular systems
An individual developing entirely in $0.38 ext{g}$ might develop skeletal and cardiovascular structures ill-suited for $1 ext{g}$, potentially leading to severe shock or requiring lifelong physical therapy upon exposure to Earth's full gravity.

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