The nursing student is studying drug dosage and has learned that there are three systems of measurement associated with drug dosing.
what are these systems? ( select all that apply)

a. metric system
b. mercalli system
c. apothecary system
d. household measurement system
e. avoirdupois system

System associated with drug dosing are apothecary system, household measurement system, metric system

Explanation:

Pharmacology uses three measurement system for the purpose of dosage of drugs given of the patients. They are the household measurement system, the metric system and the apothecary system.  When a patient is not admitted in a hospital or in any healthcare center then this type of system is used. This is suitable for the patients who reside at home.

Tablespoons, teaspoons, ounces,pounds,gallons,etc are some of the measurements of this type of system. The measurements of the apothecary measurement system are ounce, pound, scruple, gram. The metric measurement system uses cubic centimeter ,liters (L), cubic milliliters (ml) and the weight units are milligrams, kilograms, etc.

the answer is b.) hydrogen bonds between bases.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.