What is the function of a cell wall? A) to protect and support the cell
B) to perform different functions in each cell
C) to prevent water from passing through it
D) to prevent oxygen from entering the cell

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).

Ithink ahopefully im correct 

For a collision to be successful you need 2 different objects