Fill in the blanks appropriately
`{:(" Organ","Excretory wastes"),((a)" Kidneys",............................),((b)" Lungs",............................),((c)" Liver",............................),((d)" Skin",............................):}`

Explanation

(a) Urine (with water, urea, uric acid, creatinine, `K^(+), H^(+)`, etc).
(b) `CO_(2)` and water
(c ) Bile pigments, cholesterol, degraded steroid hormones,
(d) Sweat (water, NaCl, lactic acid, some urea) and sebum (oil) (sterols, waxes, hydrocarbons, etc).