Question

a change that is useful to us​

Answer 1

There are many useful changes some of them are:

1. Turn of the lights and fans when u r not there in the room do that we can save electricity.

2. Don't use much water, while brushing dont turn on the tap and use only one bucket of water for bathing and etc so that we can save water.

3. Recycling the newspaper so that we don't need to cut more trees enough.

And etc.

Hope it helps you plz mark as brainiliest.

Answer 2

A chemical change is necessary....




That is not reversible....and good too....