What allows the grasses in a tall grass prairie to grow so tall compared with the grasses in a short grass prairie ?

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).

Answerelement;

Answerit is not a suspension or colloid mixture, it is a solution mixture;