Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Mesoderm type of cell layer do flatworms have.
What type of cell layer do flatworms have?

Standard measurements in science are very important so that we can compare experimental data from one lab to another and make sure we all are talking about the same thing.
What in science are very important so that we can compare experimental data from one lab to another and make sure we all are talking about the same thing?

As per the kinetic-molecular theory, in random directions direction do the molecules and ions of liquids move.

As per the kinetic-molecular theory, in what direction do the molecules and ions of liquids move?