Scientists consistently link two catastrophic events with the five major mass extinctions recorded throughout earth's history. these two events are
a) global ice ages and the impact of asteroids.
b) the impact of asteroids and volcanic eruptions.
c) lack of atmospheric oxygen and volcanic eruptions.
d) global ice ages and the rise and fall of sea level.

This patient undergoes a gallbladder sonogram due to epigastric pain. the report indicates that the visualized portions of the liver are normal. no free fluid noted within morisons pouch. the gallbladder is identified and is empty no evidence of wall thickening or surrounding fluid is seen there is no ductal dilation. the common hepatic duct and common bile duct measure 0.4 and 0.8 cm respectively. the common bile ductmeasurement is at the upper limits of normal what cpt code in icd-10 cm code was used