In which situation is one likely to discover situs inversus? when performing an x-ray on a young child for the first time
while performing an electrocardiogram
when doing a sleep study
while fitting a prosthetic

X-ray

Explanation:

X-rays show an outline of the heart;

Situs inversus is when the organs are all on the opposite side of the body compared to normal;

The heart, therefore, will be found on the right than the left;

This would be visible on an x-ray

not sure if this what   you'r looking for would be percent composition