D milk turning sour
the other options are physical changes
Answer:
Aluminium is ordinarily classified as a metal. It is lustrous, malleable and ductile, and has high electrical and thermal conductivity. Like most metals, it has a close-packed crystalline structure and forms a cation in an aqueous solution.
Complex meaning more complicated and detailed in difficulty
Answer:
The state with the lowest possible energy consistent with the state of maximum disorder
so letter A
