________ Critical thinking should be something a medical assistant must remember to do

During properly performed external chest compression on an adult, how should the heel of the hand be positioned?

a. Three finger widths above the xiphoid tip, middle of sternum b. Two finger widths below the manubrium, upper sternum c. One finger width below the intermammary line, midsternal line d. Two finger widths above the xiphoid tip, lower half of sternum

A dark image occurs when the developing solution is diluted

Indicate whether the statement is true or false