Which observations show that a change in state of matter has occurred? wood burns, producing gas and an ashy residue. overnight, dew forms on the grass. an alkali indicator changes color when added to a cleaner. vinegar has a strong smell

When dew forms, it’s a change in a state of matter from water vapor to liquid. When vinegar evaporates, it also represents a change in state. The reason we can smell vinegar in a bottle is because it’s evaporating.

So the answers are

B: Overnight, dew forms on the grass.

D: Vinegar has a strong smell

the supermassive black hole is in the middle of the galaxy.