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The process by which evolution occurs is called ___.  

Which of the following includes prokaryotic organisms?

The control group in an experiment receives all the same treatments as the experimental group(s), except for the one dependent variable that is being tested.  

A premature infant with hyaline membrane disease has suddenly deteriorated while receiving mechanical ventilation. A chest x-ray has confirmed that the infant suffered a left-sided tension pneumothorax. What recommendation should be made at this time?

In the picture above, which lobe is being drained?

A 6-hour-old neonate with RDS is being mechanically ventilated with a time-cycled, pressure-limited ventilator. The infant is noted to have increasing PaCO2 levels. Which of the following would best be used to assess for a change in lung compliance?

A three-year-old boy has presented to the ER with respiratory distress and stridor accompanied by drooling. The physician suspects epiglottitis, but cannot rule out other possibilities, such as severe tonsillitis or foreign body obstruction. Which of the following diagnostic procedures would you recommend in this situation?

A 10-year-old cystic fibrosis patient is receiving continuous aerosol therapy via a disposable large volume nebulizer, delivering an FiO2 of 0.40 at 10 L/min. The child is coughing frequently and producing thick, tenacious secretions. What action would be most efficacious in increasing the water output of the nebulizer?

The respiratory care practitioner is performing ventilator rounds in the PICU and observes the needle on the pressure manometer of a ventilator vibrating as it moves to the peak inspiratory pressure level during each inspiration. What is the probable cause of this situation?

Which of the following clinical conditions displays the thumb sign on a lateral neck X-ray?