A summary of selected ledger accounts appears below for Solomon's Electrical Services for the current calendar year-end. (1) 
The $18,000 debit to Retained Earnings on December 31 must represent
Definitions:
Kidney
An organ in vertebrates that filters waste from the blood, regulates body fluids, and excretes urine.
Urine Concentration
The process by which the kidneys regulate the water content and solute composition of the urine.
Urea
Urea is a nitrogenous compound produced in the liver as a waste product of protein metabolism, excreted in urine.
Collecting Ducts
Channels within the kidneys responsible for gathering urine from the nephrons and moving it towards the renal pelvis.
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