When a physical change occurs what cannot be affected as well?
a. size
b. shape
c. density
d. composition

Physical changes are changes affecting the form of a chemical substance, but not it`s chemical composition. 
A physical change, changes the following:
-appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others. 

C. density(the degree of compactness of a substance)

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.