What are the building blocks of starch molecules​

Its a hope this

B"hf and f-"  is the correct answer took the test on edgenuity and got it right     

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).