1. Many significant envinnmental roles are carried out by marine ecosystems, explain with exa-
mples.
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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

the right answer is

74300-26

47563 (which stands for cholecystectomy with cholangiography).

and also:

47600 for cholecystectomy

47605 with cholangiography

the gallbladder is an organ of the digestive system. contained in the abdominal cavity, it serves as a reservoir for the bile secreted by the liver, which empties it via the common bile duct into the duodenum (initial part of the small intestine). bile participates in digestion.

ablation of the gallbladder or cholecystectomy is indicated in case of gallbladder stones (symptomatic stones). the intervention prevents recurrences and complications.