Write an original definition for acid, base, indicator.

The most plausible answer is b, duration. the given amount of time is considered how long it last for.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.