Randomized Controlled Studies: This is a study in which 1) There are two groups, one treatment group and one control group. The treatment group receives the treatment under investigation, and the control group receives either no treatment (placebo) or standard treatment. 2) Patients are randomly assigned to all groups.
winds that blow in a steady direction can move a dune. such wind will consistently pick up sand from one side and deposit it to a other side. this causes the entire dune to s â¦ lowly move in the direction if the wind.
Water particles (molecules) move transversely to the direction of propagation of the wave. That means that as the wave moves out across the water, which is its direction of prâ¦opagation, the water molecules move up and down (transversely) to create the crests and troughs of the wave. Lost in fact and fiction.