All substances take up the least amount of volume in their (1.) solid phase, a little more volume in their (2.) liquid phase, and the largest amount of volume in their (3.) gas phase. The closer atoms or molecules get to one another, the less volume is occupied by the substance that they comprise.
A large, retrospective series examining human bite wounds in children found that none of the bites manifesting as abrasions became infected, while the rate of infection was much higher in bite wounds that caused punctures or lacerations.
The human jaw can exert a suprising amount of force when it bites down. A human bite has been tested to a force of an average 117 to 265 lbs. Some humans can bite with stronger or weaker force, depending upon their individual strength. Yes, the answer above is generally correct. However, human jaw muscles, like any muscle, can be developed with proper excersize.