Can someone please explain what relocation, hierarchical, contagious, and stimulus diffusion have in common?

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

*giving 20 free points plus brainliest for this drivers ed question * ! which of the following is not the name of a dash gauge? a. speedometer b. gear meter c. odometer d. temperature gauge

During the decline of the harappan civilization, which group came to power in the indus valley