Acontrolled scientific investigation determines the effect of a(n) variable in an experiment.

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.

Electrical charges of ionic bonds

A1 a 2 a 3 ooh lol i think that's it

True or false:   the purpose of a defense mechanism is to get uncomfortable feelings out into the open so they can be dealt with in a healthy manner.indeed true: )