Trisomy for most autosomes is fatal, yet trisomy or even tetrasomy (four copies) of the X chromosome is not. What is the explanation for this difference

c. would be the answer : )

explanation:

in the initial assessment of breathing, signs of respiratory distress must be noted (if present), such as the use of accessory muscles for breathing, abdominal breathing and grunting respiration. next, respiratory rate must be observed. increasing breathing rate may be a sign of sickness.