The organisms in an ecosystem that break down organic
material and recycle nutrients are called:

Ithink the answer is a or d.

Butterfly wingspan is 7.7

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).