The circulatory system picks up nitrogenous wastes from the cells and delivers them to the kidneys. The kidneys remove these wastes from the blood and concentrates them into the urine that is eliminated from the body.
Appropriate symbol for an isotope of potassium - 39 corresponding to the isotope notion r A ZX
CO2 ; H20- They are the only ones that, on both sides, combined with another element and bonding of atoms
Use the rule of 3 simple
50 g mean 100% 0,1895 mean x% cross multiplie and calcule the x value x = 0,1895*100/50 = ?%
