Dirt. y t or d?

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Facial shaving brushes are either bulb-shaped or fan-shaped. an experiment is to be conducted to determine whether the lather thickness is the same for both types of shaving brushes. in previous studies, it was determined that shaving brush size (small, medium, large) is associated with lather thickness, but shaving brush type (wolf whiskers, maggard razors, frank shaving, and so on) is not associated with lather thickness. how could the experiment best be conducted? by blocking on shaving brush size by blocking on shaving brush type by blocking on shaving brush shape by blocking on lather thickness without blocking

50 ! if you could have one clothing item of your choice, but it was in either of these colors, which would you choose out of each category? blue or pink red or yellow red or green green or purple blue or green

How do astronomers measure the amount of dark matter in the universe