Identify basic units of the commonly used systems of measurement.

Identification should include the basic units of measurement

apothecary system
metric system
U.S. Customary System, including the avoirdupois system (with relevance to medication dosing and body weight measurement).

Process/Skill Questions:

Why are different systems of measurement used?
Why must workers in the veterinary industry be skillful in using the basic units of all commonly used systems of measurement?
What could be the consequences of confusing two different systems of measurement when measuring?