6. Explain the importance of the law of conservation of mass.

The answer is B) because I did an assignment thats just like this. First, have an unflated balloon, measuring tape, and marker. Then, put make A, B, C, and D, on the balloon. Measure A,B  B,C  B,D  and more. Blow the balloon 3/4 and do the same as the other (measure A,B). Blow 1/2. Just keep on doing that and you will get the answer for the assignment, that you haven't done.

Hope this helps...