The basic unit of volume in the metric system is the what does the prefix micro- mean? what is the abbreviation for the meter in the metric system? the basic unit of weight (mass) in the metric system is the what does the prefix centi- mean? what is the temperature of boiling water in the metric system? what does the prefix kilo- mean? which focus knob is used with the high power objective? what is the total magnification when using the 10x objective? which parts of a microscope regulate the amount of light? which focus knob is used with the 5x objective? . a total magnification of 400x requires the use of the 10x ocular lens with which objective? define the following terms: solution solute solvent what is avogadro's number? define the term molarity. what is a mole? define homeostasis. list at least three variables in the human body regulated by negative feedback.