What are the concentrations of urea

In general, the non-renal causes of increased plasma/serum urea result in a mild to moderate increase (usually no greater than 10.0 mmol/L (BUN 28 mg/dL). Concentration in patients with renal dysfunction can range from mildly increased to severely increased, depending on severity of disease.

Explanation:

answer is a

explanation:

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a