Pour the water from part B into one of the large containers. Pour the vinegar into the other large container. Observe the two combinations. Pick up each container one at a time and place your palm on the bottom to see whether you can feel a little difference in temperature. Record what you see and feel.

It has to be:-
b. water
water waves are mechanical waves caused by the effect of external c.enrgy mostly from a.air and very little from motion of d.passing boats and it -like any other mechanical wave- requires a medium to be transported through which is b.water.
that's unlike electromagnetic waves such as light and X-rays