U1R1E1A1S1
5 points
UREAS is validvalid
UREA, two amino radicals joined by a carbonyl group, used by mammals to excrete nitrogen [n]
UREA, a substance found in mammalian urine, the chief form in which nitrogenous waste is excreted [n]
UREA, two amino radicals joined by a carbonyl group, used by mammals to excrete nitrogen [n]
UREA, a substance found in mammalian urine, the chief form in which nitrogenous waste is excreted [n]