In a lipid bilayer:
A) the hydrophilic heads of the molecules point towards each other
B) all the molecules are triglycerides
C) the hydrophobic heads point to the hydrophilic tails
D) the hydrophobic tails of the molecules point toward each other

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Heating it up with cause a quicker reaction time