About how long does it take the Sun to rotate once about its axis? A. 30 seconds
B. 10 minutes
C. 25,000 Earth years
D. 25 Earth days

The answer is probably c. xylem

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).

Ibelieve it is b. proton.hope my answer has you : )